Chains and heterogens:
PDB Chain Sequences:
>1yekH (H:) emqlqqsgaellrpgtsvklscktsgyiftsywihwvkqrsgqglewiariypgtgstyy nekfkgkatltadkssstaymqlstlksedsavyfctrwgfipvredyvmdywgqgtlvt vssakttapsvyplapvcgdttgssvtlgclvkgyfpepvtltwnsgslssgvhtfpavl qsdlytlsssvtvtsstwpsqsitcnvahpasstkvdkkiep
>1yekL (L:) divmtqspltlsvtigqpasisckssqsllysngktylnwllqrpgqspkrlihlvskld sgvpdritgsgsgtdftlkisrveaadlgvyycvqgthfpytfgggtkleilradaaptv sifppsseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysm sstltltkdeyerhnsytceathktstspivksfnrnec