>1s7tA (A:) observed residues (from ATOM records)
gphslryfvtavsrpglgeprymevgyvddtefvrfdsdaenpryeprarwmeqegpeyw
eretqkakgneqsfrvdlrtllgyynqskggshtiqvisgcevgsdgrllrgyqqyaydg
cdyialnedlktwtaadmaalitkhkweqageaerlraylegtcvewlrrylkngnatll
rtdspkahvthhsrpedkvtlrcwalgfypaditltwqlngeeliqdmelvetrpagdgt
fqkwasvvvplgkeqyytchvyhqglpepltlrwep