Plate 23 



A. Portion of granular and cornified layers of the plantar skin of a rat 

 showing keratohyalin granules; KH , keratohyalin ; C, " transformed " 

 keratohyalin ; T, microbodies ; B, cell membrane D. 



B. Illustrating the development of the basal-layer cells of the epidermis 

 of a 12-day-old chicken embryo. C, collagen fibrils below the basement 

 membrane (here cut obliquely); F, fibroblast containing filaments; E, 

 epidermal cell; G, intercellular gap; X, intercellular exudate; m, mito- 

 chondrion (PTA stain). 



