Chains and heterogens:
PDB Chain Sequences:
>1mk8A (A:) ttplvhvasvekgrsyedfqkvynaialklreddeydnyigygpvlvrlawytsgtwdkh dntggsyggtyrfkkefndpsnaglqngfkflepihkefpwissgdlfslggvtavqemq gpkipwrcgrvdtpedttpdngrlpdadkdadyvrtffqrlnmndrevvalmgahalgkt hlknsgyegpwgaannvftnefylnllnedwklekndanneqwdsksgymmlptdysliq dpkylsivkeyandqdkffkdfskafekllengitfpkdapspfifktleeqgl