>3prvB (B:) observed residues (from ATOM records)
mtsertfiavkpdgvqrclvgeiiqrfekkgyklvalkmlqpsaeqaqqhyidlaskpfy
kdlvayfssgpivgmvwegkgvvkggrvllgatnpadslpgtirgdfavdvgrnvchgsd
svdsakreiafwfkpeelvnwtshsvkqvye