Chains and heterogens:
PDB Chain Sequences:
>1a3rH (H:) vqlqqsgaelvrpgasvklscttsgfnikdiyihwvkqrpeqglewigrldpangytkyd pkfqgkatitvdtssntaylhlssltsedtavyycdgyysyydmdywgpgtsvtvssakt tapsvyplapvcgdttgssvtlgclvkgyfpepvtltwnsgslssgvhtfpavlqsdlyt lsssvtvtsstwpsqsitcnvahpasstkvdkkiepr
>1a3rH (H:) vqlqqsgaelvrpgasvklscttsgfnikdiyihwvkqrpeqglewigrldpangytkyd pkfqgkatitvdtssntaylhlssltsedtavyycdgyysyydmdywgpgtsvtvssakt tapsvyplapvcssvtlgclvkgyfpepvtltwnsgslssgvhtfpavlqsdlytlsssv tvtsstwpsqsitcnvahpasstkvdkkiepr
>1a3rL (L:) divmtqspssltvttgekvtmtckssqsllnsrtqknyltwyqqkpgqspklliywastr esgvpdrftgsgsgtdftlsisgvqaedlavyycqnnynypltfgagtklelkradaapt vsifppsseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstys msstltltkdeyerhnsytceathktstspivksfnrnec