Expression of CCL21 and CCL25 proteins in E11.5 3PPs of MafB-deficient mice. Sagittal sections of frozen embryos from indicated mice were 2-color–stained either for CCL21 (pink) and keratin (blue) or for CCL25 (pink) and keratin (blue). Anterior-posterior (A-P) and dorsal-ventral (D-V) orientations of the sections are indicated. Scale bars indicate 100 μm. Two representative datasets (nos. 1 and 2) of 10 to 14 different sections are shown.