Transplantation of human iPSCs and PGCLCs into ovaries of recipient mice. (i) left ovary: control ovary without transplantation; right ovary: teratoma from iPSC‐reconstituted ovary; (ii) PGCLC‐reconstituted ovaries. Note that no teratomas had formed. Bottom panels: Immunohistochemical analysis for NUMA in sections of iPSC‐ and PGCLC‐reconstituted ovaries. (iii) iPSC‐induced teratoma shown in (i); (iv) ovary containing NUMA+ cells shown in (ii). Insert: higher magnification of selected area. Scale bars: (i) and (ii), 0.5 cm; (iii) and (iv), 50 μm. 