>3k51A (A:) observed residues (from ATOM records)
gdkprahltvvrqtptqhfknqfpalhwehelglaftknrmnytnkfllipesgdyfiys
qvtfrgmpdsitvvitkvtdsypeptqllmgtksvsgsnwfqpiylgamfslqegdklmv
nvsdislvdytkedktffgafll