HEADSC 3fpo SEQCRD A H HIS HIS 1 1 C C 0 SEQCRD A S SER SER 2 2 C C 0 SEQCRD A S SER SER 3 3 C C 0 SEQCRD A N ASN ASN 4 4 C C 0 SEQCRD A N ASN ASN 5 5 C C 0 SEQCRD A F PHE PHE 6 6 C C 0 PARAME method XRAY PARAME resolution 1.500 PARAME R-factor 0.140 PARAME FreeR-factor 0.154