Figure 1 DZP and DMCM induce opposing actions on the GABA
dose–response relationship. (a) Oocytes expressing recombinant
GABAA receptors were exposed to increasing concentrations of
GABA. The top row of traces are currents in response to GABA,
but in the absence of DZP. The bottom row of traces are currents
from the same occyte, but with coapplication of 1 mM DZP. (b) The
maximum GABA-activated currents are plotted for GABA alone
(filled circles), GABA plus 1 mM DZP (open circles), and GABA plus
DMCM (shaded circles). The data were fitted with Equation (1)
and the EC50’s were 41.073.0 (N ¼ 6), 21.772.7 (N ¼ 6), and
118.376.8 mM (N ¼ 5), respectively.