Chains and heterogens:
PDB Chain Sequences:
>1cr9H (H:) kvklqqsgaelvrsgasvklsctasgfnikdyyiqwvkqrpeqglewigwidpengnsey aprfqgkatmtadtlsntaylqlssltsedtavyycnadlhdywgqgttltvssakttap svyplapvcgdttgssvtlgclvkgyfpepvtltwnsgslssgvhtfpavlqsdlytlss svtvtsstwpsqsitcnvahpasstkvdkkieprvts
>1cr9L (L:) dvvmtqtplslsvtigqpasisckssqslldsdgktyliwvfqrpgqspkrliflvskrd sgvpdrftgsgsgtdftlkisrveaedvgvyycwqgthfphtvgggtkleiaradaaptv sifppsseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysm sstltltkdeyerhnsytceathktstspivksfnrnec