Chains and heterogens:
PDB Chain Sequences:
>1a37A (A:) mdknelvqkaklaeqaeryddmaacmksvteqgaelsneernllsvayknvvgarrsswr vvssieqktegaekkqqmareyrekietelrdicndvlsllekflipnasqaeskvfylk mkgdyyrylaevaagddkkgivdqsqqayqeafeiskkemqpthpirlglalnfsvfyye ilnspekacslaktafdeaiaeldtlseesykdstlimqllrdnltlw
>1a37A (A:) mdknelvqkaklaeqaeryddmaacmksvteqgaelsneernllsvayknvvgarrsswr vvssieqekkqqmareyrekietelrdicndvlsllekflipnaaeskvfylkmkgdyyr ylaevaagddkkgivdqsqqayqeafeiskirlglalnfsvfyyacslaktafdeaiadd stlimqllrdnltlw
>1a37B (B:) mdknelvqkaklaeqaeryddmaacmksvteqgaelsneernllsvayknvvgarrsswr vvssieqktegaekkqqmareyrekietelrdicndvlsllekflipnasqaeskvfylk mkgdyyrylaevaagddkkgivdqsqqayqeafeiskkemqpthpirlglalnfsvfyye ilnspekacslaktafdeaiaeldtlseesykdstlimqllrdnltlw
>1a37B (B:) mdknelvqkaklaeqaeryddmaacmksvteqgaelsneernllsvayknvvgarrsswr vvssieqekkqqmareyrekietelrdicndvlsllekflipnaaeskvfylkmkgdyyr ylaevaagddkkgivdqsqqayqeafeiskirlglalnfsvfyyacslaktafdeaiadd stlimqllrdnltlw