Chains and heterogens:
PDB Chain Sequences:
>1mexH (H:) qvqlqqsdaelvkpgasvkisckasgytftdhaihwvkqkpeqglewigyispgngdiky nekfkgkatltadkssstaymqlnsltsedsavyfckmeyldywgqgttltvssggttpp svyplapgsaaqaatnsvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytls ssvtvpsstwpsqsvtcnvahpasstavdkkiapa
>1mexH (H:) qvqlqqsdaelvkpgasvkisckasgytftdhaihwvkqkpglewigyispgngdikyne kfkgkatltadkssstaymqlnsltsedsavyfckmeyldywgqgttltvssggttppsv yplapgsaaqtnsvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytlsssvt vpsstwpsqsvtcnvahpasstavdkkiapa
>1mexL (L:) divmtqsqkfmstslgnrvsvtckasqnvgtnvawfqqkpgqspktliysasyrysgvpd rftgsgsgtdftltinnvqsedlaeyfcqqynsypytfgggtkleikradaaptvsifpp sseqltgggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrne