Expression of Cx36 in parvalbumin-immunoreactive cells in the rat retina.A, Double-labeling of a rat retina vertical section with antibodies against parvalbumin (red) and Cx36 (green). Only the vitreal half of the retina is shown. Arrows indicate lobular appendages of AII amacrine cells. B, Enlarged view of a single parvalbumin-positive AII amacrine cell from a different vertical section. All Cx36-immunoreactive puncta in sublamina b of the IPL are in register with AII amacrine cell dendrites. C, Horizontal section of the rat retina cut at the S3–S4 level of the IPL and double-labeled with parvalbumin (red) and Cx36 (green). Scale bars: A, 50 μm;B, C, 10 μm.