Table 1.

Performance of a helix-loop-helix model in describing the x-ray structure (20) of TM domains in the leucine transporter LeuT_Aa of Aquifex aeolicus (PDB identifier 2A65)

TM domain	Loop position, p	Loop length, l	Backbone RMSD (Å)
I	14	6	0.15
II	14	2	0.17
III	22	1	0.45
IV	11	2	0.05
V	7	3	0.06
VI	15	5	0.06
VII	16	7	0.09
VIII	21	4	0.12
IX	14	3	0.05
X	9	3	0.09
XI	23	1	1.50
XII	17	2	0.06