Chains and heterogens:
PDB Chain Sequences:
>2vtk_ (-) mptllrvyidgphgmgkttttqllvalgsrddivyvpepmtywrvlgasetianiyttqh rldqgeisagdaavvmtsaqitmgmpyavtdavlaphiggeagsshapppaltlifdrhp iaallcypaarylmgsmtpqavlafvalipptlpgtnivlgalpedrhidrlakrqrpge rldlamlaairrvygllantvrylqcggswredwgqlsgtavppqgaepqsnagprphig dtlftlfrapellapngdlynvfawaldvlakrlrsmhvfildydqspagcrdallqlts gmvqthvttpgsipticdlartfaremgean
>2vtk_ (-) mptllrvyidgphgmgkttttqllvalgsrddivyvpepmtywrvlgasetianiyttqh rldqgeisagdaavvmtsaqitmgmpyavtdavlaphiggeagspppaltlifdrhpiaa llcypaarylmgsmtpqavlafvalipptlpgtnivlgalpedrhidrlakrqrpgerld lamlaairrvygllantvrylqcggswredwgqlsgprphigdtlftlfrapellapngd lynvfawaldvlakrlrsmhvfildydqspagcrdallqltsgmvqthvttpgsipticd lartfaremgean