Chains and heterogens:
PDB Chain Sequences:
>1q54A (A:) mqtehvillnaqgvptgtlekyaahtadtrlhlafsswlfnakgqllvtrralskkawpg vwtnsvaghpqlgesnedavirrcryelgveitppesiypdfryratdpsgivenevcpv faarttsalqinddevmdyqwcdladvlhgidatpwafspwmvmqatnrearkrlsaftq lkl
>1q54A (A:) ehvillnaqgvptgtlekyaahtadtrlhlafsswlfnakgqllvtrralskkawpgvwt nsvaghpqlgesnedavirrcryelgveitppesiypdfryratdpsgivenevcpvfaa rttsalqinddevmdyqwcdladvlhgidatpwafspwmvmqatnrearkrlsaft
>1q54B (B:) mqtehvillnaqgvptgtlekyaahtadtrlhlafsswlfnakgqllvtrralskkawpg vwtnsvaghpqlgesnedavirrcryelgveitppesiypdfryratdpsgivenevcpv faarttsalqinddevmdyqwcdladvlhgidatpwafspwmvmqatnrearkrlsaftq lkl
>1q54B (B:) ehvillnaqgvptgtlekyaahtadtrlhlafsswlfnakgqllvtrralskkawpgvwt nsvaghpqlgesnedavirrcryelgveitppesiypdfryratdpsgivenevcpvfaa rttsalqinddevmdyqwcdladvlhgidatpwafspwmvmqatnrearkrlsaftqlkl