>3fb3B (B:) observed residues (from ATOM records)
nlyfqgvdlelrvleesdlsshlellghlteapplsgvelaniadmrrragivtkvfchq
ptgrivgsaslmiqpkftrggravghiedvvvdpsyrgaglgkalimdlceisrskgcyk
vildssekslpfyeklgfraherqmrldl