Chains and heterogens:
PDB Chain Sequences:
>1mpaH (H:) evnlqqsgtvlarpgasvrmsckasgysftsywlhwikqrpgqglewiggiypgnrdtry tqrfkdkakltavtsantaymelssltnedsavyycsiiyfdyadfimdywgqgttvtvs sakttapsvyplapvcgdttgssvtlgclvkgyfpepvtltwnsgslssgvhtfpavlqs dlytlsssvtvtsstwpsqsitcnvahpasstkvdkkieprgpti
>1mpaL (L:) divmtqtplslpvslgdkasiscrssqalvhsngntylhwylqkpgqspklliykvsnrf sgvpdrfsgsgsgtdftlkisrveaedlgvffcsqsthvprtfgggtkleikradaaptv sifppsseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysm sstltltkdeyerhnsytceathktstspivksfnrnec