>1xxxB (B:) observed residues (from ATOM records)
fdvaarlgtlltamvtpfsgdgsldtataarlanhlvdqgcdglvvsgttgesptttdge
kiellravleavgdrarviagagtydtahsirlakacaaegahgllvvtpyyskppqrgl
qahftavadatelpmllydipgrsavpiepdtiralashpnivgvkdakadlhsgaqima
dtglayysgddalnlpwlamgatgfisviahlaagqlrellsafgsgdiatarkiniava
plcnamsrlggvtlskaglrlqgidvgdprlpqvaatpeqidalaadmraasvlr