>2f23B (B:) observed residues (from ATOM records)
revkltkagyerlmqqlerererlqeatkilqelmessddyddsgleaakqekarieari
dsledilsravileegsgeviglgsvveledplsgerlsvqvvspaeanvldtpmkisda
spmgkallghrvgdvlsldtpkgkrefrvvaihg