>3r51A (A:) observed residues (from ATOM records)
qlaahsdarsgpvgsnggqfwsfrpvrplnkivlsfsgspdqtlnlisitfssnptdiit
vggvgpepltytetvnidgdiieisgmianykgynvirsikfttnkkeygpyganagtpf
nikipdgnkivgffgnsgwyvdaigayytak