Chains and heterogens:
PDB Chain Sequences:
>2xtkA (A:) fsnlaiywgqgpnqlrlshfcqetsldiinigfinyfpdmspghwpgsnfgnqcdgsvyv tndgvvtkllsgchqimedipicqaagkkvllsiggayppdqsilsedsavafatflwga fgpvaegwegprpfgdvvvdgfdfdiehnggfgyatmvntfrqyfnqvperkfylsaapq ciipdaqlsdaifnaafdfiwiqyyntaacsaksfidtslgtfnfdawvtvlkasaskda klyvglpasetaanqgyyltpdeveslvstymdrypdtfggimlweatasennqidgapy adhmkdillh
>2xtkB (B:) fsnlaiywgqgpnqlrlshfcqetsldiinigfinyfpdmspghwpgsnfgnqcdgsvyv tndgvvtkllsgchqimedipicqaagkkvllsiggayppdqsilsedsavafatflwga fgpvaegwegprpfgdvvvdgfdfdiehnggfgyatmvntfrqyfnqvperkfylsaapq ciipdaqlsdaifnaafdfiwiqyyntaacsaksfidtslgtfnfdawvtvlkasaskda klyvglpasetaanqgyyltpdeveslvstymdrypdtfggimlweatasennqidgapy adhmkdillh
>2xtkB (B:) snlaiywgqgpnqlrlshfcqetsldiinigfinyfpdmspghwpgsnfgnqcdgsvyvt ndgvvtkllsgchqimedipicqaagkkvllsiggayppdqsilsedsavafatflwgaf gpvaegwegprpfgdvvvdgfdfdiehnggfgyatmvntfrqyfnqvperkfylsaapqc iipdaqlsdaifnaafdfiwiqyyntaacsaksfidtslgtfnfdawvtvlkasaskdak lyvglpasetaanqgyyltpdeveslvstymdrypdtfggimlweatasennqidgapya dhmkdillh