Chains and heterogens:
PDB Chain Sequences:
>1ppgE (E:) ivggrrarphawpfmvslqlrgghfcgatliapnfvmsaahcvanvnvravrvvlgahnl srreptrqvfavqrifengydpvnllndivilqlngsatinanvqvaqlpaqgrrlgngv qclamgwgllgrnrgiasvlqelnvtvvtslcrrsnvctlvrgrqagvcfgdsgsplvcn glihgiasfvrggcasglypdafapvaqfvnwidsiiq