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