Expression of the mhc2dab:GFP and cd45:DsRed transgenes during zebrafish development. (A) Lateral view of a 14-dpf mhc2dab:GFP transgenic fish showing reporter expression in cells scattered throughout the skin and in the thymus (arrowhead). The scale bar indicates 200μm. (B) Thymic (top panel) and skin (bottom panel) reporter expression in a double cd45:DsRed; mhc2dab:GFP transgenic fish at 12 dpf. For each location, the GFP (left), DsRed (middle), and merged (right) images are shown. The scale bar indicates 20μm.