Chains and heterogens:
PDB Chain Sequences:
>4xk1A (A:) mahhhhhhmskrafnfcagpaalpdavlqraqaelldwrgkglsvmemshrsddyvaias kaeqdlrdlldipsdykvlflqggasqqfaeiplnllpedgvadyidtgiwskkaieear rygtvnvaasakeydyfaipgqnewtltkdaayvhyasnetigglefdwipetgdvplvt dmssdilsrpldvsrfgliyagaqknigpsglvvvivredllgrarsvcptmlnyktaad ngsmyntpatyswylsglvfewlkeqggvtameqrnrakkdllyktidasdfytnpiqps arswmnvpfrladerldkpflegaeargllnlkghrsvggmrasiynalgldavealvay maefekehg
>4xk1A (A:) fnfcagpaalpdavlqraqaelldwrgkglsvmemshrsddyvaiaskaeqdlrdlldip sdykvlflqggasqqfaeiplnllpedgvadyidtgiwskkaieearrygtvnvaasake ydyfaipgqnewtltkdaayvhyasnetigglefdwipetgdvplvtdmssdilsrpldv srfgliyagaqknigpsglvvvivredllgrarsvcptmlnyktaadngsmyntpatysw ylsglvfewlkeqggvtameqrnrakkdllyktidasdfytnpiqpsarswmnvpfrlad erldkpflegaeargllnlkghrsvggmrasiynalgldavealvaymaefekeh
>4xk1B (B:) mahhhhhhmskrafnfcagpaalpdavlqraqaelldwrgkglsvmemshrsddyvaias kaeqdlrdlldipsdykvlflqggasqqfaeiplnllpedgvadyidtgiwskkaieear rygtvnvaasakeydyfaipgqnewtltkdaayvhyasnetigglefdwipetgdvplvt dmssdilsrpldvsrfgliyagaqknigpsglvvvivredllgrarsvcptmlnyktaad ngsmyntpatyswylsglvfewlkeqggvtameqrnrakkdllyktidasdfytnpiqps arswmnvpfrladerldkpflegaeargllnlkghrsvggmrasiynalgldavealvay maefekehg
>4xk1B (B:) fnfcagpaalpdavlqraqaelldwrgkglsvmemshrsddyvaiaskaeqdlrdlldip sdykvlflqggasqqfaeiplnllpedgvadyidtgiwskkaieearrygtvnvaasake ydyfaipgqnewtltkdaayvhyasnetigglefdwipetgdvplvtdmssdilsrpldv srfgliyagaqknigpsglvvvivredllgrarsvcptmlnyktaadngsmyntpatysw ylsglvfewlkeqggvtameqrnrakkdllyktidasdfytnpiqpsarswmnvpfrlad erldkpflegaeargllnlkghrsvggmrasiynalgldavealvay