Chains and heterogens:
PDB Chain Sequences:
>1u99A (A:) gshmaidenkqkalaaalgqiekqfgkgsimrlgedrsmdvetistgslsldialgaggl pmgriveiygpessgkttltlqviaaaqregktcafidaehaldpiyarklgvdidnllc sqpdtgeqaleicdalarsgavdvivvdsvaaltpkaeiegeigdshmglaarmmsqamr klagnlkqsntllifinqirmkigvmfgnpetttggnalkfyasvrldirrigavkegen vvgsetrvkvvknkiaapfkqaefqilygeginfygelvdlgvkekliekagawysykge kigqgkanatawlkdnpetakeiekkvrelllsnpnstpdfsvddsegvaetnedf
>1u99A (A:) kqkalaaalgqiekqfgkgsimrlgedrsmdvetistgslsldialgagglpmgriveiy gpessgkttltlqviaaaqregktcafidaehaldpiyarklgvdidnllcsqpdtgeqa leicdalarsgavdvivvdsvaaltpkaeieglaarmmsqamrklagnlkqsntllifin qttggnalkfyasvrldirrigavkegenvvgsetrvkvvknkiaapfkqaefqilygeg infygelvdlgvkekliekagawysykgekigqgkanatawlkdnpetakeiekkvrell l