Table 1.

Positional Parameters of Phenylalanine Residues in the Ligand Binding Domain^a

position	distance (Å) from bound aspartateb	distance (Å) from position 33c	distance (Å) from Cys36 disulfided
30	45	9	4
40	40	13	5
107	2o	29	25
140	10	55	52
150	7	57	53
180	40	16	7

^aCalculated from the crystallographic coordinates of Milburn et al. (1991).

^bDistance from the α-carbon of bound aspartate to the para-carbon position of the indicated phenylalanine ring in subunit1.

^cDistance from the α-carbon of Leu33, near the predicted membrane interface, to the para-carbon position of the indicated phenylalanine in the same subunit 1.

^dDistance from the thiol-sulfur of Cys36 to the para-carbon position of the nearest indicated phenylalanine in the dimer.