Chains and heterogens:
PDB Chain Sequences:
>1iapA (A:) sqfqsleqvkrrpahlmallqhvalqfepgpllcclhadmlgslgpkeakkafldfyhsf lektavlrvpvppnvafeldrtradlisedvqrrfvqevvqsqqvavgrqledfrskrlm gmtpweqelaqleawvgrdrasyearerhvaerllmhleemqhtistdeeksaavvnaig lymrhlgvrt