Chains and heterogens:
PDB Chain Sequences:
>1dixA (A:) asgskdfdffyfvqqwpgsycdtkqsccypttgkpaadfgihglwpnnndgtypsncdpn spydqsqisdlissmqqnwptlacpsgsgstfwshewekhgtcaesvltnqhayfkkald lknqidllsilqgadihpdgesydlvnirnaiksaigytpwiqcnvdqsgnsqlyqvyic vdgsgssliecpifpggkcgtsiefptf