>1ex4B (B:) observed residues (from ATOM records)
dsspgiwqldcthlegkvilvavhvasgyieaevipaetgqetayfllklagrwpvktih
tdngsnftgatvraacdwagikqvvesmnkelkkiigqvrdqaehlktavqmavfihnkk
rkggiggysagerivdiiatdiqtkelqkqitkiqnfrvyyrdsrnslwkgpakllwkge
gavviqdnsdikvvprrkakiird