Fig. 4
From: Vitrification freezing of large ovarian tissue in the human body
Comparison on apoptosis staining between the freezing groups and fresh groups (TUNEL, × 400). (a) Apoptosis positive primordial follicle in the vitrification freezing group. (b) Apoptosis positive primordial follicle and primary follicle in the programmed freezing group. (c) Apoptosis negative primordial follicle in the fresh control group