Figure 17. Bivariate glycine (abscissa) and photopic light-stimulated AGB signals (ordinate) for the validated bipolar cells shown in Figure 14 form unique clusters. OFF cone bipolar cells (black) have some of the strongest light-driven responses, while the mean response of most coupled ON cone bipolar cells (orange) is weaker. WF bipolar cells form a small subgroup within the entire G+ ON bipolar cell cluster (blue). Rod bipolar cells show no significant response. Conversely, three non-coupled, G- cone BCs terminating high in the ON layer have extremely strong responses (white). The stimulus regime was a 3 Hz pulse train of 3 yellow/black pulse cycles followed by one blue/black pulse cycle with a 50% duty cycle over 90 min.