>1sz2B (B:) observed residues (from ATOM records)
tkyalvgdvggtnarlalcdiasgeisqaktysgldypsleavirvyleehkvevkdgci
aiacpitgdwvamtnhtwafsiaemkknlgfshleiindftavsmaipmlkkehliqfgg
aepvegkpiavygagtglgvahlvhvdkrwvslpgegghvdfapnseeeaiileilraei
ghvsaervlsgpglvnlyraivkadnrlpenlkpkditeraladsctdcrralslfcvim
grfggnlalnlgtfggvfiaggivprfleffkasgfraafedkgrfkeyvhdipvylivh
dnpgllgsgahlrqtlghil