>4xy2B (B:) observed residues (from ATOM records)
hmsictseewqglmqftlpvrlckeielfhfdigpfenmwpgifvymvhrscgtscfele
klcrfimsvkknyrrvpyhnwkhavtvahcmyailqnnhtlftdlerkglliaclchdld
hrgfsnsylqkfplaalyststmeqhhfsqtvsilqleghnifstlssseyeqvleiirk
aiiatdlalyfgnrkqleemyqtgslnlnnqshrdrviglmmtacdlcsvtklwpvtklt
andiyaefwaegdemkklgiqpipmmdrdkkdevpqgqlgfynavaipcyttltqilppt
epllkacrdnlsqwekvirgee