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Figure 3: Effect of TPMPA on rat-isolated PII. (a) Representative TPMPA waveforms (thick) compared to its fellow control eye (thin). Luminance is given in log cd·m−2 along the left. Grouped average (±SEM) amplitudes at fixed times of 50 (b) and 400 ms (c) are plotted against luminance. TPMPA-treated (black filled) data are compared against control eyes (grey areas indicate 95% confidence intervals of controls as calculated from the SEM).