Figure 3.

Semithin sections stained by toluidine blue show the atretic follicles and stroma. (A) Atretic follicle with irregular membrane (white arrowhead). (B) Advanced atretic follicle (white arrowhead). Note that the yolk is completely reabsorbed, while the zona radiata and follicular cells are completely digested. (C,D) The stroma contained fibroblasts (white arrowheads). (E) The stroma contained mast cells (white arrowheads) and telocytes (black arrowhead). (F) The stroma contained fat cells (black arrowheads), macrophages (white arrowhead), and stromal cells (asterisk).