HEADSC 2olx SEQCRD A N ASN ASN 1 1 C C 0 SEQCRD A N ASN ASN 2 2 C C 0 SEQCRD A Q GLN GLN 3 3 C C 0 SEQCRD A Q GLN GLN 4 4 C C 0 PARAME method XRAY PARAME resolution 1.420 PARAME R-factor 0.188 PARAME FreeR-factor 0.235