HEADSC 4rp7 SEQCRD Z T THR THR 1 1 C C 0 SEQCRD Z I ILE ILE 2 2 C C 0 SEQCRD Z I ILE ILE 3 3 C C 0 SEQCRD Z T THR THR 4 4 C C 0 SEQCRD Z L LEU LEU 5 5 C C 0 SEQCRD Z E GLU GLU 6 6 C C 0 PARAME method XRAY PARAME resolution 1.576 PARAME R-factor 0.1666 PARAME FreeR-factor 0.1925