Chains and heterogens:
PDB Chain Sequences:
>1kxnA (A:) lvhvasvekgrsyedfqkvynaialklreddeydnyigygpvlvrlawhisgtwdkhdnt ggsyggtyrfkkefndpsnaglqngfkflepihkefpwissgdlfslggvtavqemqgpk ipwrcgrvdtpedttpdngrlpdadkdagyvrtffqrlnmndrevvalmgahalgkthlk nsgyegggannvftnefylnllnedwklekndanneqwdsksgymmlptdysliqdpkyl sivkeyandqdkffkdfskafekllengitfpkdapspfifktleeqgl