Chains and heterogens:
PDB Chain Sequences:
>1itbA (A:) apvrslnctlrdsqqkslvmsgpyelkalhlqgqdmeqqvvfsmsfvqgeesndkipval glkeknlylscvlkddkptlqlesvdpknypkkkmekrfvfnkieinnklefesaqfpnw yistsqaenmpvflggtkggqditdftmqfvss
>1itbB (B:) leadkckereekiilvssaneidvrpcplnpnehkgtitwykddsktpvsteqasrihqh keklwfvpakvedsghyycvvrnssyclrikisakfvenepnlcynaqaifkqklpvagd gglvcpymeffknennelpklqwykdckpllldnihfsgvkdrlivmnvaekhrgnytch asytylgkqypitrviefitleenkptrpvivspanetmevdlgsqiqlicnvtgqlsdi aywkwngsvideddpvlgedyysvenpankrrstlitvlniseiesrfykhpftcfaknt hgidaayiqliypvt
>1itbB (B:) ckereekiilvssaneidvrpcplnpnehkgtitwykddsktpvsteqasrihqhkeklw fvpakvedsghyycvvrnssyclrikisakfvenepnlcynaqaifkqklpvagdgglvc pymeffknennelpklqwykdckpllldnihfsgvkdrlivmnvaekhrgnytchasyty lgkqypitrviefitleenkptrpvivspanetmevdlgsqiqlicnvtgqlsdiaywkw ngsvideddpvlgedyysvenpankrrstlitvlniseiesrfykhpftcfaknthgida ayiqliypvt