>2a3rB (B:) observed residues (from ATOM records)
rppleyvkgvplikyfaealgplqsfqarpddllintypksgttwvsqildmiyqggdle
kcnrapiyvrvpflevndpgepsgletlkdtppprlikshlplallpqtlldqkvkvvyv
arnpkdvavsyyhfhrmekahpepgtwdsflekfmagevsygswyqhvqewwelsrthpv
lylfyedmkenpkreiqkilefvgrslpeetmdfmvqhtsfkemkknpmtnyttvpqelm
dhsispfmrkgmagdwkttftvaqnerfdadyaekmagcslsfrsel