Chains and heterogens:
PDB Chain Sequences:
>1el4A (A:) sskyavklktdfdnprwikrhkhmfdfldingngkitldeivskasddicakleatpeqt krhqvcveaffrgcgmeygkeiafpqfldgwkqlatselkkwarneptlirewgdavfdi fdkdgsgtitldewkaygkisgispsqedceatfrhcdldnsgdldvdemtrqhlgfwyt ldpeadglygngvp