>3r50B (B:) observed residues (from ATOM records)
malqlaahsdarsgpvgsnggqfwsfrpvrplnkivlsfsgspdqtlnlisitfssnptd
iitvggvgpepltytetvnidgdiieisgmianykgynvirsikfttnkkeygpyganag
tpfnikipdgnkivgffgnsgwyvdaigayytak