Chains and heterogens:
PDB Chain Sequences:
>1a4kA (A:) elvmtqtplslpvslgdqasiscrssqsllhsngntylhwylqkpgqspklliykvsnrf sgvpdrfsgsgsgtdftlkisrveaedlgvyfcsqvthvpptfgggtkleikrtvaapsv fifppsdeqlksgtasvvcllnnfypreakvqwkvdnalqsgnsqesvteqdskdstysl sstltlskadyekhkvyacevthqglsspvtksfnrg
>1a4kA (A:) elvmtqtplslpvslgdqasiscrssqsllhsngntylhwylqkpgqspklliykvsnrf sgvpdrfsgsgsgtdftlkisrveaedlgvyfcsqvthvpptfgggtkleikrtvaapsv fifppsdeqlksgtasvvcllnnfypreakvqwkvdnalqsgnsqesvteqdskdstysl sstltlskadyekhkvyacevthqglsspvtksfnr
>1a4kB (B:) qvqllesgpelkkpgetvkisckasgytftnygmnwvkqapgkglkwmgwintytgepty addfkgrfafsletsastaylqinnlknedtatyfcvqaerlrrtfdywgagttvtvssa stkgpsvfplapsskstsggtaalgclvkdyfpepvtvswnsgaltsgvhtfpavlqssg lyslssvvtvpssslgtqtyicnvnhkpsntkvdkkvep
>1a4kH (H:) qvqllesgpelkkpgetvkisckasgytftnygmnwvkqapgkglkwmgwintytgepty addfkgrfafsletsastaylqinnlknedtatyfcvqaerlrrtfdywgagttvtvssa stkgpsvfplapsskstsggtaalgclvkdyfpepvtvswnsgaltsgvhtfpavlqssg lyslssvvtvpssslgtqtyicnvnhkpsntkvdkkvep
>1a4kH (H:) qvqllesgpelkkpgetvkisckasgytftnygmnwvkqapgkglkwmgwintytgepty addfkgrfafsletsastaylqinnlknedtatyfcvqaerlrrtfdywgagttvtvssa stkgpsvfplapsskstsggtaalgclvkdyfpepvtvswnsgaltsgvhtfpavlqssg lyslssvvtvpssslgtqtyicnvnhkpsntkvdkkv
>1a4kL (L:) elvmtqtplslpvslgdqasiscrssqsllhsngntylhwylqkpgqspklliykvsnrf sgvpdrfsgsgsgtdftlkisrveaedlgvyfcsqvthvpptfgggtkleikrtvaapsv fifppsdeqlksgtasvvcllnnfypreakvqwkvdnalqsgnsqesvteqdskdstysl sstltlskadyekhkvyacevthqglsspvtksfnrg