Figure 3 - Overlay image of differential interference contrast (DIC) and confocal LSM images of microradioautographs of mouse deferent duct 3 min after intravenous injection of ¹²⁵I-insulin. Numerous silver grains can be seen in the lamina propria (LP), but not in the epithelium (ET) or smooth muscle layer (SML). Bar = 50 µm.