Chains and heterogens:
PDB Chain Sequences:
>1q2uA (A:) maskralvilakgaeemetvipvdvmrragikvtvaglagkdpvqcsrdvvicpdasled akkegpydvvvlpggnlgaqnlsesaavkeilkeqenrkgliaaicagptallaheigfg skvtthplakdkmmngghytysenrvekdgliltsrgpgtsfefalaivealngkevaaq vkaplvlkd