The distances of TM2–TM6 and the RMSD values of the TXP motif in eight stable states.

States	The distance of TM2–TM6 (Å)	The RMSD values of the TXP motif (Å)
State I	18.3	0.35
State II	22.4	0.35
State III	21.3	0.85
State IV	17.1	0.85
State V	15.2	0.31
State VI	15.3	0.81
State VII	22.3	0.37
State VIII	22.4	0.90