>4k3eM (M:) observed residues (from ATOM records)
vlnqpssvsgslgqrvsitcsgsssnvgngyvswyqlipgsaprtliygdtsrasgvpdr
fsgsrsgntatltisslqaedeadyfcasaedsssnavfgsgttltvlgqpksppsvtlf
ppsteelngnkatlvclisdfypgsvtvvwkadgstitrnvettraskqsnskyaassyl
sltssdwkskgsyscevthegstvtktvkpsec