Chains and heterogens:
PDB Chain Sequences:
>1tkgA (A:) mpvitlpdgsqrhydhavspmdvaldigpglakaciagrvngelvdacdliendaqlsii takdeegleiirhscahllghaikqlwphtkmaigpvidngfyydvdldrtltqedveal ekrmhelaeknydvikkkvswhearetfanrgesykvsildeniahddkpglyfheeyvd mcrgphvpnmrfchhfklmktagaywrgdsnnkmlqriygtawa