>2r27B (B:) observed residues (from ATOM records)
atkavavlkgdgpvqgiinfeqkesngpvkvwgsikglteglhgfhvhefgdntagctsa
gphfnplrsvgslgnvtadkdgvadvsiedsvislsgdhsiigrtlvvhekaddlgkggn
agsrlacgvigiaq