>>6VSU:HELIX  109 AM1 ASP H  131  GLU H  148  1                                  18    
DDDRLMNVISESVKLVME
Search OCA for entries with sequence similar to this one (with E=10)

HELIX 109 AM1 ASP H 131 GLU H 148 1 18 ATOM 17779 N ASP H 131 81.090 64.810 38.600 1.00 52.86 N ANISOU17779 N ASP H 131 9947 3411 6724 -561 2198 -339 N ATOM 17780 CA ASP H 131 81.607 64.100 39.806 1.00 52.18 C ANISOU17780 CA ASP H 131 9719 3488 6617 -771 2067 -465 C ATOM 17781 C ASP H 131 80.972 62.706 39.864 1.00 49.05 C ANISOU17781 C ASP H 131 9053 3400 6183 -609 1970 -446 C ATOM 17782 O ASP H 131 80.052 62.448 39.075 1.00 47.93 O ANISOU17782 O ASP H 131 8864 3318 6027 -343 2010 -360 O ATOM 17783 CB ASP H 131 81.435 64.960 41.055 1.00 53.96 C ANISOU17783 CB ASP H 131 10192 3522 6787 -863 2090 -631 C ATOM 17784 CG ASP H 131 80.010 65.152 41.549 1.00 55.44 C ANISOU17784 CG ASP H 131 10501 3672 6892 -581 2151 -697 C ATOM 17785 OD1 ASP H 131 79.110 64.351 41.238 1.00 53.51 O ANISOU17785 OD1 ASP H 131 10087 3621 6622 -342 2133 -642 O ATOM 17786 OD2 ASP H 131 79.806 66.115 42.297 1.00 61.23 O ANISOU17786 OD2 ASP H 131 11500 4181 7583 -611 2219 -812 O ATOM 17787 N ASP H 132 81.419 61.829 40.767 1.00 48.14 N ANISOU17787 N ASP H 132 8771 3473 6047 -763 1842 -523 N ATOM 17788 CA ASP H 132 80.997 60.401 40.744 1.00 45.43 C ANISOU17788 CA ASP H 132 8163 3419 5677 -647 1747 -490 C ATOM 17789 C ASP H 132 79.531 60.304 41.168 1.00 44.49 C ANISOU17789 C ASP H 132 8092 3330 5481 -396 1785 -539 C ATOM 17790 O ASP H 132 78.826 59.401 40.664 1.00 42.14 O ANISOU17790 O ASP H 132 7622 3215 5174 -216 1759 -474 O ATOM 17791 CB ASP H 132 81.959 59.517 41.542 1.00 45.61 C ANISOU17791 CB ASP H 132 8009 3620 5701 -877 1604 -540 C ATOM 17792 CG ASP H 132 83.140 58.960 40.734 1.00 46.67 C ANISOU17792 CG ASP H 132 7946 3864 5921 -1011 1553 -436 C ATOM 17793 OD1 ASP H 132 83.045 58.813 39.450 1.00 45.58 O ANISOU17793 OD1 ASP H 132 7745 3744 5828 -881 1613 -310 O ATOM 17794 OD2 ASP H 132 84.169 58.665 41.377 1.00 48.30 O ANISOU17794 OD2 ASP H 132 8057 4146 6145 -1241 1452 -480 O ATOM 17795 N ASP H 133 79.091 61.195 42.070 1.00 45.71 N ANISOU17795 N ASP H 133 8471 3314 5581 -391 1846 -656 N ATOM 17796 CA ASP H 133 77.690 61.255 42.563 1.00 45.44 C ANISOU17796 CA ASP H 133 8498 3291 5473 -151 1908 -713 C ATOM 17797 C ASP H 133 76.758 61.457 41.368 1.00 45.61 C ANISOU17797 C ASP H 133 8510 3294 5523 138 1992 -597 C ATOM 17798 O ASP H 133 75.788 60.684 41.221 1.00 43.51 O ANISOU17798 O ASP H 133 8083 3215 5233 331 1974 -568 O ATOM 17799 CB ASP H 133 77.511 62.349 43.625 1.00 47.31 C ANISOU17799 CB ASP H 133 9018 3306 5650 -197 1983 -857 C ATOM 17800 CG ASP H 133 78.038 61.965 44.992 1.00 46.70 C ANISOU17800 CG ASP H 133 8935 3305 5503 -421 1887 -989 C ATOM 17801 OD1 ASP H 133 78.042 60.780 45.301 1.00 44.08 O ANISOU17801 OD1 ASP H 133 8384 3217 5146 -446 1786 -979 O ATOM 17802 OD2 ASP H 133 78.374 62.877 45.757 1.00 50.11 O ANISOU17802 OD2 ASP H 133 9602 3541 5895 -557 1919 -1106 O ATOM 17803 N ARG H 134 77.055 62.441 40.520 1.00 47.89 N ANISOU17803 N ARG H 134 8963 3372 5860 160 2075 -525 N ATOM 17804 CA ARG H 134 76.215 62.735 39.328 1.00 49.33 C ANISOU17804 CA ARG H 134 9163 3521 6057 444 2150 -403 C ATOM 17805 C ARG H 134 76.345 61.587 38.310 1.00 45.72 C ANISOU17805 C ARG H 134 8438 3304 5628 483 2065 -281 C ATOM 17806 O ARG H 134 75.322 61.170 37.714 1.00 44.83 O ANISOU17806 O ARG H 134 8218 3320 5495 730 2063 -219 O ATOM 17807 CB ARG H 134 76.606 64.107 38.783 1.00 53.78 C ANISOU17807 CB ARG H 134 10005 3774 6655 431 2264 -359 C ATOM 17808 CG ARG H 134 75.455 64.884 38.165 1.00 57.70 C ANISOU17808 CG ARG H 134 10649 4141 7131 762 2374 -295 C ATOM 17809 CD ARG H 134 75.463 66.309 38.713 1.00 62.94 C ANISOU17809 CD ARG H 134 11661 4466 7785 748 2498 -373 C ATOM 17810 NE ARG H 134 76.800 66.920 38.680 1.00 66.07 N ANISOU17810 NE ARG H 134 12208 4664 8228 440 2514 -379 N ATOM 17811 CZ ARG H 134 77.207 67.802 37.777 1.00 69.78 C ANISOU17811 CZ ARG H 134 12866 4907 8739 435 2604 -275 C ATOM 17812 NH1 ARG H 134 76.380 68.220 36.825 1.00 71.25 N ANISOU17812 NH1 ARG H 134 13134 5023 8915 739 2682 -154 N ATOM 17813 NH2 ARG H 134 78.447 68.269 37.833 1.00 72.23 N ANISOU17813 NH2 ARG H 134 13281 5064 9099 121 2616 -289 N ATOM 17814 N LEU H 135 77.539 61.043 38.115 1.00 43.49 N ANISOU17814 N LEU H 135 8039 3096 5388 252 1993 -251 N ATOM 17815 CA LEU H 135 77.691 59.944 37.128 1.00 41.17 C ANISOU17815 CA LEU H 135 7511 3018 5115 296 1923 -142 C ATOM 17816 C LEU H 135 76.864 58.731 37.585 1.00 39.17 C ANISOU17816 C LEU H 135 7049 3014 4818 395 1836 -182 C ATOM 17817 O LEU H 135 76.153 58.180 36.762 1.00 39.05 O ANISOU17817 O LEU H 135 6917 3128 4791 580 1820 -108 O ATOM 17818 CB LEU H 135 79.175 59.607 37.002 1.00 40.68 C ANISOU17818 CB LEU H 135 7361 2985 5108 26 1872 -117 C ATOM 17819 CG LEU H 135 79.516 58.327 36.254 1.00 38.09 C ANISOU17819 CG LEU H 135 6784 2890 4797 30 1792 -34 C ATOM 17820 CD1 LEU H 135 78.989 58.411 34.841 1.00 38.06 C ANISOU17820 CD1 LEU H 135 6791 2886 4784 244 1846 92 C ATOM 17821 CD2 LEU H 135 81.021 58.109 36.258 1.00 37.81 C ANISOU17821 CD2 LEU H 135 6666 2875 4823 -232 1755 -18 C ATOM 17822 N MET H 136 76.906 58.338 38.855 1.00 37.78 N ANISOU17822 N MET H 136 6837 2903 4612 276 1784 -297 N ATOM 17823 CA MET H 136 76.062 57.210 39.297 1.00 36.81 C ANISOU17823 CA MET H 136 6533 3006 4446 367 1719 -329 C ATOM 17824 C MET H 136 74.568 57.544 39.147 1.00 36.02 C ANISOU17824 C MET H 136 6466 2907 4311 643 1790 -329 C ATOM 17825 O MET H 136 73.776 56.644 38.812 1.00 33.69 O ANISOU17825 O MET H 136 5992 2806 4002 772 1747 -295 O ATOM 17826 CB MET H 136 76.391 56.786 40.731 1.00 37.32 C ANISOU17826 CB MET H 136 6581 3129 4470 190 1659 -445 C ATOM 17827 CG MET H 136 77.841 56.360 40.892 1.00 37.79 C ANISOU17827 CG MET H 136 6571 3222 4564 -66 1569 -439 C ATOM 17828 SD MET H 136 78.444 55.170 39.638 1.00 37.32 S ANISOU17828 SD MET H 136 6274 3342 4564 -66 1494 -307 S ATOM 17829 CE MET H 136 79.186 53.911 40.685 1.00 35.43 C ANISOU17829 CE MET H 136 5872 3285 4304 -256 1356 -357 C ATOM 17830 N ASN H 137 74.180 58.782 39.385 1.00 37.45 N ANISOU17830 N ASN H 137 6863 2884 4480 734 1895 -366 N ATOM 17831 CA ASN H 137 72.765 59.198 39.229 1.00 38.71 C ANISOU17831 CA ASN H 137 7052 3041 4613 1022 1972 -361 C ATOM 17832 C ASN H 137 72.346 58.978 37.778 1.00 38.65 C ANISOU17832 C ASN H 137 6944 3113 4629 1207 1954 -224 C ATOM 17833 O ASN H 137 71.248 58.460 37.553 1.00 38.50 O ANISOU17833 O ASN H 137 6776 3261 4590 1395 1934 -206 O ATOM 17834 CB ASN H 137 72.537 60.647 39.658 1.00 41.17 C ANISOU17834 CB ASN H 137 7646 3084 4912 1098 2098 -417 C ATOM 17835 CG ASN H 137 72.501 60.823 41.163 1.00 42.28 C ANISOU17835 CG ASN H 137 7883 3180 5000 989 2126 -570 C ATOM 17836 OD1 ASN H 137 72.223 61.929 41.610 1.00 45.63 O ANISOU17836 OD1 ASN H 137 8541 3393 5403 1060 2233 -634 O ATOM 17837 ND2 ASN H 137 72.782 59.782 41.953 1.00 40.45 N ANISOU17837 ND2 ASN H 137 7498 3132 4739 825 2036 -629 N ATOM 17838 N VAL H 138 73.216 59.324 36.843 1.00 38.93 N ANISOU17838 N VAL H 138 7050 3042 4699 1141 1957 -134 N ATOM 17839 CA VAL H 138 72.949 59.145 35.395 1.00 39.63 C ANISOU17839 CA VAL H 138 7070 3196 4791 1303 1939 1 C ATOM 17840 C VAL H 138 72.761 57.659 35.074 1.00 37.24 C ANISOU17840 C VAL H 138 6495 3174 4478 1290 1822 21 C ATOM 17841 O VAL H 138 71.931 57.312 34.199 1.00 35.81 O ANISOU17841 O VAL H 138 6212 3118 4275 1484 1790 91 O ATOM 17842 CB VAL H 138 74.088 59.746 34.553 1.00 40.55 C ANISOU17842 CB VAL H 138 7322 3144 4940 1190 1978 90 C ATOM 17843 CG1 VAL H 138 73.901 59.355 33.098 1.00 40.91 C ANISOU17843 CG1 VAL H 138 7282 3291 4969 1333 1947 225 C ATOM 17844 CG2 VAL H 138 74.166 61.258 34.707 1.00 42.85 C ANISOU17844 CG2 VAL H 138 7906 3134 5240 1222 2102 84 C ATOM 17845 N ILE H 139 73.558 56.805 35.711 1.00 36.35 N ANISOU17845 N ILE H 139 6278 3154 4380 1064 1755 -32 N ATOM 17846 CA ILE H 139 73.452 55.336 35.496 1.00 34.53 C ANISOU17846 CA ILE H 139 5810 3168 4140 1034 1647 -20 C ATOM 17847 C ILE H 139 72.062 54.882 35.992 1.00 34.25 C ANISOU17847 C ILE H 139 5661 3282 4071 1183 1632 -72 C ATOM 17848 O ILE H 139 71.369 54.141 35.244 1.00 32.81 O ANISOU17848 O ILE H 139 5326 3265 3874 1302 1575 -24 O ATOM 17849 CB ILE H 139 74.648 54.629 36.165 1.00 34.43 C ANISOU17849 CB ILE H 139 5734 3197 4150 772 1586 -63 C ATOM 17850 CG1 ILE H 139 75.941 54.973 35.419 1.00 35.09 C ANISOU17850 CG1 ILE H 139 5878 3176 4276 648 1602 8 C ATOM 17851 CG2 ILE H 139 74.436 53.119 36.277 1.00 32.70 C ANISOU17851 CG2 ILE H 139 5300 3206 3916 740 1486 -74 C ATOM 17852 CD1 ILE H 139 77.199 54.648 36.218 1.00 35.03 C ANISOU17852 CD1 ILE H 139 5838 3169 4300 389 1557 -40 C ATOM 17853 N SER H 140 71.662 55.330 37.195 1.00 34.32 N ANISOU17853 N SER H 140 5742 3233 4063 1174 1686 -169 N ATOM 17854 CA SER H 140 70.309 55.136 37.761 1.00 34.65 C ANISOU17854 CA SER H 140 5697 3393 4075 1326 1709 -222 C ATOM 17855 C SER H 140 69.242 55.614 36.764 1.00 36.16 C ANISOU17855 C SER H 140 5868 3605 4265 1602 1738 -149 C ATOM 17856 O SER H 140 68.352 54.798 36.421 1.00 35.54 O ANISOU17856 O SER H 140 5592 3732 4177 1701 1680 -130 O ATOM 17857 CB SER H 140 70.181 55.812 39.106 1.00 35.30 C ANISOU17857 CB SER H 140 5917 3361 4131 1287 1792 -333 C ATOM 17858 OG SER H 140 70.916 55.076 40.086 1.00 33.53 O ANISOU17858 OG SER H 140 5656 3192 3889 1051 1736 -402 O ATOM 17859 N GLU H 141 69.286 56.866 36.326 1.00 38.62 N ANISOU17859 N GLU H 141 6373 3717 4584 1724 1818 -107 N ATOM 17860 CA GLU H 141 68.244 57.395 35.404 1.00 41.65 C ANISOU17860 CA GLU H 141 6750 4116 4958 2015 1842 -28 C ATOM 17861 C GLU H 141 68.217 56.545 34.115 1.00 39.77 C ANISOU17861 C GLU H 141 6352 4046 4712 2051 1732 70 C ATOM 17862 O GLU H 141 67.103 56.311 33.556 1.00 39.35 O ANISOU17862 O GLU H 141 6161 4149 4639 2255 1692 108 O ATOM 17863 CB GLU H 141 68.456 58.874 35.081 1.00 46.39 C ANISOU17863 CB GLU H 141 7619 4443 5563 2128 1946 15 C ATOM 17864 CG GLU H 141 68.599 59.770 36.293 1.00 50.46 C ANISOU17864 CG GLU H 141 8334 4758 6080 2075 2056 -90 C ATOM 17865 CD GLU H 141 67.312 60.055 37.062 1.00 56.57 C ANISOU17865 CD GLU H 141 9077 5581 6834 2280 2127 -162 C ATOM 17866 OE1 GLU H 141 66.421 59.168 37.074 1.00 58.66 O ANISOU17866 OE1 GLU H 141 9097 6098 7092 2363 2072 -166 O ATOM 17867 OE2 GLU H 141 67.192 61.189 37.642 1.00 62.35 O ANISOU17867 OE2 GLU H 141 10037 6092 7559 2358 2247 -214 O ATOM 17868 N SER H 142 69.380 56.039 33.691 1.00 37.33 N ANISOU17868 N SER H 142 6046 3724 4411 1857 1682 104 N ATOM 17869 CA SER H 142 69.519 55.285 32.433 1.00 36.66 C ANISOU17869 CA SER H 142 5852 3769 4308 1879 1592 193 C ATOM 17870 C SER H 142 68.755 53.973 32.559 1.00 35.33 C ANISOU17870 C SER H 142 5436 3860 4125 1875 1493 153 C ATOM 17871 O SER H 142 67.981 53.638 31.669 1.00 35.74 O ANISOU17871 O SER H 142 5381 4051 4147 2026 1429 205 O ATOM 17872 CB SER H 142 70.976 55.084 32.096 1.00 35.72 C ANISOU17872 CB SER H 142 5795 3568 4206 1671 1585 227 C ATOM 17873 OG SER H 142 71.524 56.315 31.636 1.00 36.73 O ANISOU17873 OG SER H 142 6144 3469 4342 1704 1676 292 O ATOM 17874 N VAL H 143 68.938 53.297 33.680 1.00 33.98 N ANISOU17874 N VAL H 143 5190 3749 3972 1707 1482 61 N ATOM 17875 CA VAL H 143 68.189 52.058 34.021 1.00 32.85 C ANISOU17875 CA VAL H 143 4828 3833 3820 1676 1407 13 C ATOM 17876 C VAL H 143 66.679 52.351 34.053 1.00 33.86 C ANISOU17876 C VAL H 143 4860 4066 3936 1896 1426 3 C ATOM 17877 O VAL H 143 65.899 51.550 33.487 1.00 33.57 O ANISOU17877 O VAL H 143 4641 4225 3886 1956 1342 20 O ATOM 17878 CB VAL H 143 68.686 51.521 35.366 1.00 31.78 C ANISOU17878 CB VAL H 143 4679 3698 3695 1467 1416 -76 C ATOM 17879 CG1 VAL H 143 67.765 50.432 35.881 1.00 31.61 C ANISOU17879 CG1 VAL H 143 4464 3884 3663 1448 1371 -127 C ATOM 17880 CG2 VAL H 143 70.112 51.036 35.253 1.00 29.89 C ANISOU17880 CG2 VAL H 143 4479 3405 3470 1264 1374 -59 C ATOM 17881 N LYS H 144 66.279 53.470 34.647 1.00 35.13 N ANISOU17881 N LYS H 144 5138 4104 4105 2015 1531 -23 N ATOM 17882 CA LYS H 144 64.846 53.830 34.787 1.00 37.29 C ANISOU17882 CA LYS H 144 5315 4477 4376 2244 1568 -35 C ATOM 17883 C LYS H 144 64.229 54.008 33.410 1.00 38.73 C ANISOU17883 C LYS H 144 5436 4737 4540 2457 1502 64 C ATOM 17884 O LYS H 144 63.058 53.583 33.209 1.00 39.25 O ANISOU17884 O LYS H 144 5298 5010 4603 2586 1453 64 O ATOM 17885 CB LYS H 144 64.693 55.060 35.664 1.00 38.85 C ANISOU17885 CB LYS H 144 5690 4491 4579 2336 1706 -84 C ATOM 17886 CG LYS H 144 64.982 54.735 37.121 1.00 38.65 C ANISOU17886 CG LYS H 144 5681 4452 4549 2146 1758 -197 C ATOM 17887 CD LYS H 144 64.564 55.790 38.089 1.00 40.60 C ANISOU17887 CD LYS H 144 6074 4562 4787 2252 1897 -268 C ATOM 17888 CE LYS H 144 64.974 55.448 39.505 1.00 40.57 C ANISOU17888 CE LYS H 144 6114 4543 4758 2044 1938 -379 C ATOM 17889 NZ LYS H 144 64.381 56.396 40.491 1.00 43.37 N ANISOU17889 NZ LYS H 144 6598 4791 5089 2166 2083 -461 N ATOM 17890 N LEU H 145 65.019 54.561 32.499 1.00 39.47 N ANISOU17890 N LEU H 145 5695 4682 4620 2477 1498 147 N ATOM 17891 CA LEU H 145 64.603 54.825 31.100 1.00 41.10 C ANISOU17891 CA LEU H 145 5894 4934 4788 2680 1435 257 C ATOM 17892 C LEU H 145 64.255 53.482 30.439 1.00 39.29 C ANISOU17892 C LEU H 145 5437 4956 4532 2623 1291 263 C ATOM 17893 O LEU H 145 63.245 53.395 29.732 1.00 40.39 O ANISOU17893 O LEU H 145 5447 5255 4643 2806 1218 304 O ATOM 17894 CB LEU H 145 65.767 55.525 30.388 1.00 42.51 C ANISOU17894 CB LEU H 145 6310 4889 4951 2640 1474 338 C ATOM 17895 CG LEU H 145 65.598 56.981 29.955 1.00 45.43 C ANISOU17895 CG LEU H 145 6895 5056 5307 2862 1562 418 C ATOM 17896 CD1 LEU H 145 64.566 57.725 30.735 1.00 47.45 C ANISOU17896 CD1 LEU H 145 7155 5286 5585 3055 1641 372 C ATOM 17897 CD2 LEU H 145 66.933 57.710 29.999 1.00 46.26 C ANISOU17897 CD2 LEU H 145 7255 4891 5429 2712 1654 441 C ATOM 17898 N VAL H 146 65.031 52.442 30.694 1.00 36.61 N ANISOU17898 N VAL H 146 5048 4659 4202 2377 1248 219 N ATOM 17899 CA VAL H 146 64.698 51.083 30.195 1.00 35.73 C ANISOU17899 CA VAL H 146 4736 4771 4067 2300 1119 206 C ATOM 17900 C VAL H 146 63.404 50.599 30.869 1.00 36.83 C ANISOU17900 C VAL H 146 4657 5107 4228 2342 1098 139 C ATOM 17901 O VAL H 146 62.494 50.093 30.134 1.00 37.61 O ANISOU17901 O VAL H 146 4586 5403 4301 2435 995 158 O ATOM 17902 CB VAL H 146 65.875 50.127 30.428 1.00 33.83 C ANISOU17902 CB VAL H 146 4515 4502 3837 2039 1096 174 C ATOM 17903 CG1 VAL H 146 65.540 48.678 30.130 1.00 32.72 C ANISOU17903 CG1 VAL H 146 4190 4562 3677 1939 980 142 C ATOM 17904 CG2 VAL H 146 67.068 50.584 29.626 1.00 33.53 C ANISOU17904 CG2 VAL H 146 4657 4303 3779 2012 1119 249 C ATOM 17905 N MET H 147 63.271 50.781 32.190 1.00 36.59 N ANISOU17905 N MET H 147 4627 5037 4239 2282 1194 64 N ATOM 17906 CA MET H 147 62.140 50.160 32.929 1.00 37.67 C ANISOU17906 CA MET H 147 4545 5370 4397 2277 1191 -3 C ATOM 17907 C MET H 147 60.821 50.838 32.531 1.00 39.50 C ANISOU17907 C MET H 147 4664 5713 4629 2553 1193 29 C ATOM 17908 O MET H 147 59.843 50.117 32.447 1.00 38.15 O ANISOU17908 O MET H 147 4260 5768 4466 2565 1127 8 O ATOM 17909 CB MET H 147 62.339 50.211 34.444 1.00 37.22 C ANISOU17909 CB MET H 147 4535 5242 4365 2152 1303 -88 C ATOM 17910 CG MET H 147 63.604 49.483 34.866 1.00 34.94 C ANISOU17910 CG MET H 147 4334 4869 4073 1889 1282 -116 C ATOM 17911 SD MET H 147 63.913 49.640 36.630 1.00 35.49 S ANISOU17911 SD MET H 147 4490 4846 4147 1749 1400 -210 S ATOM 17912 CE MET H 147 62.626 48.546 37.255 1.00 35.04 C ANISOU17912 CE MET H 147 4173 5045 4094 1710 1392 -264 C ATOM 17913 N GLU H 148 60.852 52.122 32.184 1.00 41.79 N ATOM 17914 CA GLU H 148 59.661 52.923 31.787 1.00 46.62 C ATOM 17915 C GLU H 148 59.146 52.518 30.394 1.00 46.96 C ATOM 17916 O GLU H 148 58.037 52.954 30.044 1.00 48.79 O ATOM 17917 CB GLU H 148 59.997 54.412 31.823 1.00 50.33 C ATOM 17918 CG GLU H 148 59.764 55.009 33.199 1.00 55.02 C ATOM 17919 CD GLU H 148 60.533 56.280 33.553 1.00 58.96 C ATOM 17920 OE1 GLU H 148 61.054 56.963 32.601 1.00 60.87 O ATOM 17921 OE2 GLU H 148 60.649 56.569 34.798 1.00 61.30 O