Chains and heterogens:
PDB Chain Sequences:
>1s5sA (A:) ivggytcaansipyqvslnsgshfcggslinsqwvvsaahcyksriqvrlgehnidvleg neqfinaakiithpnfngntldndimliklsspatlnsrvatvslprscaaagteclisg wgntkssgssypsllqclkapvlsdssckssypgqitgnmicvgfleggkdscqgdsggp vvcngqlqgivswgygcaqknkpgvytkvcnyvnwiqqtiaan