Chains and heterogens:
PDB Chain Sequences:
>1sur_ (-) skldlnalnelpkvdrilalaetnaelekldaegrvawaldnlpgeyvlsssfgiqaavs lhlvnqirpdipviltdtgylfpetyrfideltdklklnlkvyratesaawqearygklw eqgvegiekyndinkvepmnralkelnaqtwfaglrreqsgsranlpvlaiqrgvfkvlp iidwdnrtiyqylqkhglkyhplwdegylsvgdth