>5z50B (B:) observed residues (from ATOM records)
gtlsiatthtqaryalpnvisgfikqypdvslhmhqgtpmqiaemaadgtvdfaiateal
elfgdlimmpcyrwnrcvivphghpltklpkltlealaeqpivtyvfgftgrskldeafs
qrglvpkvvftaadadviktyvrlglgvgivahmavdpkldndlvildashlfessvtki
gfrrgtflrgfmcdfiekfaphltrellakavqchnkaeldelfdgielpvy