Fig. 3.

Skin sections of fetal cats [(A), at 3, 5, and 7 weeks of gestation] stained with hematoxylin and eosin, together with unstained flat-mount (en face) skin preparations of fetal cats [(B), at 7 weeks of gestation]. The 7-week images in (B) are from an orange (O/Y or O/O) individual, which allows the dark component of the tabby pattern (which is orange-colored) to be more easily visualized. In the trans-illuminated “dermis-up” panel, hair follicle outlines (dashed red lines) appear light-colored; melanin incorporation and blood vessels appear dark-colored. Scale bars in (A), 150, 50, and 250 μm in 3-, 5-, and 7-week fetal cat sections, respectively, and 50 μm in the 7-week epidermis close-up. Scale bars in (B), 2 mm, 100 μm, and 600 μm in epidermis-up, follicle histology, and dermis-up panels, respectively.