HEADSC 1r3z SEQCRD A G DG GUA 1 1 C C 0 SEQCRD A X 5CM CYM 2 2 C C 0 SEQCRD A G DG GUA 3 3 C C 0 SEQCRD A X 5CM CYM 4 4 C C 0 SEQCRD A G DG GUA 5 5 C C 0 SEQCRD A C DC CYT 6 6 C C 0 SEQCRD A G DG GUA 7 7 C C 0 SEQCRD A C DC CYT 8 8 C C 0 PARAME method XRAY PARAME resolution 1.7 PARAME R-factor 0.193 PARAME FreeR-factor 0.203