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