>4nt0B (B:) observed residues (from ATOM records)
rsrrvdvmdvmnrlilamdlmnrddalrvtgevreyidtvkigyplvlsegmdiiaefrk
rfgcriiadfkvadipetnekicratfkagadaiivhgfpgadsvraclnvaeemgrevf
lltemshpgaemfiqgaadeiarmgvdlgvknyvgpstrperlsrlreiigqdsflispg
etlrfadaiivgrsiyladnpaaaaagiiesik