>4fxrB (B:) observed residues (from ATOM records)
vmnrlilamdlmnrddalrvtgevreyidtvkigyplvlsegmdiiaefrkrfgcriiad
fkvadipetnekicratfkagadaiivhgfpgadsvraclnvaeemgrevflltemshpg
aemfiqgaadeiarmgvdlgvknyvgpsvrperlsrlreiigqdsflispgvgaqggdpg
etlrfadaiivgasiyladnpaaaaagiiesikdllnp