>1bl3B (B:) observed residues (from ATOM records)
spgiwqldcthlegkvilvavhvasgyieaevipaetgqetayfllklagrwpvktvhtd
ngsnftsttvkaacwwagikqefviesmnkelkkiigqvrdqaehlktavqmavfihnhk
rkggiggysagerivdiiatdiq