Morphological control. An injected axon terminal (green) from a Cx36-deficient retina labeled with peanut agglutinin (red). No evidence of sprouting of the axon terminal or synaptic contacts with cones was seen. A, Image stack. B, Single scan. C, High magnification of the boxed area in B. Scale bars: A, B, 20 μm; C, 10 μm.