Chains and heterogens:
PDB Chain Sequences:
>1mrcH (H:) qvqlqqsgaelvkpgasvklsckasgytftsywmqwvkqrpgqglewigeidpsdsytny nqkfkgkatltvdtssstaymqlssltsedsavyycanlrgyfdywgqgttltvssaktt ppsvyplapgcgdttgssvtlgclvkgyfpesvtvtwnsgslsssvhtfpallqsglytm sssvtvpsstwpsqtvtcsvahpassttvdkklep
>1mrcH (H:) qvqlqqsgaelvkpgasvklsckasgytftsywmqwvkqrpgqglewigeisytnynqkf kgkatltvdstaymqlssltsedsavyycanlrgyfdywgqgttltvssakttppsvypl apttgssvtlgclvkgyfpesvtvtwnsgslsssvhtfpallqsglytmsssvtvpsstw psqtvtcsvahpassttvdkklep
>1mrcL (L:) dvvmtqtplslpvslgdqasiscrssqslvhsngntylhwylqkpgqspklliykvsnrf sgvpdrfsgsgsgtdftlkisrveaedlgvyfcsqsthvprtfgggtkleikradaaptv sifppsseqltsggasvvcflnnfypkdinvkwkidgkerqngvlnswtdqnskdstysm sstltltkdeyerhnsytceathktstspivksfnr