Chains and heterogens:
PDB Chain Sequences:
>1a12A (A:) kkvkvshrshstepglvltlgqgdvgqlglgenvmerkkpalvsipedvvqaeaggmhtv clsksgqvysfgcndegalgrdtsvegsemvpgkvelqekvvqvsagdshtaaltddgrv flwgsfrdnngvigllepmkksmvpvqvqldvpvvkvasgndhlvmltadgdlytlgcge qgqlgrvpelfanrggrqglerllvpkcvmlksrgsrghvrfqdafcgayftfaishegh vygfglsnyhqlgtpgtescfipqnltsfknstkswvgfsggqhhtvcmdsegkayslgr aeygrlglgegaeeksiptlisrlpavssvacgasvgyavtkdgrvfawgmgtnyqlgtg qdedawspvemmgkqlenrvvlsvssggqhtvllvkdkeqs
>1a12B (B:) kkvkvshrshstepglvltlgqgdvgqlglgenvmerkkpalvsipedvvqaeaggmhtv clsksgqvysfgcndegalgrdtsvegsemvpgkvelqekvvqvsagdshtaaltddgrv flwgsfrdnngvigllepmkksmvpvqvqldvpvvkvasgndhlvmltadgdlytlgcge qgqlgrvpelfanrggrqglerllvpkcvmlksrgsrghvrfqdafcgayftfaishegh vygfglsnyhqlgtpgtescfipqnltsfknstkswvgfsggqhhtvcmdsegkayslgr aeygrlglgegaeeksiptlisrlpavssvacgasvgyavtkdgrvfawgmgtnyqlgtg qdedawspvemmgkqlenrvvlsvssggqhtvllvkdkeqs
>1a12C (C:) kkvkvshrshstepglvltlgqgdvgqlglgenvmerkkpalvsipedvvqaeaggmhtv clsksgqvysfgcndegalgrdtsvegsemvpgkvelqekvvqvsagdshtaaltddgrv flwgsfrdnngvigllepmkksmvpvqvqldvpvvkvasgndhlvmltadgdlytlgcge qgqlgrvpelfanrggrqglerllvpkcvmlksrgsrghvrfqdafcgayftfaishegh vygfglsnyhqlgtpgtescfipqnltsfknstkswvgfsggqhhtvcmdsegkayslgr aeygrlglgegaeeksiptlisrlpavssvacgasvgyavtkdgrvfawgmgtnyqlgtg qdedawspvemmgkqlenrvvlsvssggqhtvllvkdkeqs