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Fig. 7. Kinetic properties of agNAT8 transport mechanism. (A) The effects of
increasing phenylalanine concentration on agNAT8-mediated currents; values are
means ± s.e.m.; N
3. (B) The effects of increasing sodium
ion concentration on phenylalanine-elicited, agNAT8-mediated currents; values
are means ± s.e.m.; N
3, except for L-Met,
N=1. (C) E0.5 for substrates with highest
apparent transport velocity; values are means ± s.d.; N
3.
(D) Estimated Hill coefficient for selected substrates; values are means
± s.d.; N
3. Lines in A and B represent iterative
nonlinear regression of the data with three-parameter Hill function
(E[S]0.5 and
[S] are
incorporated in the graph panels; see inserts).