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Fig. 4. Cumulus-oocyte complexes from chimeric ovaries composed of either 43+/+oo/43/gc or 37/oo/37+/+gc do not undergo cumulus expansion. (A) Example of a chimeric follicle with mucified cumulus. (B) Example showing the lack of cumulus expansion. Follicles in A and B were cultured overnight in the same maturation medium and photographed at the same magnification. Bar, 50 µm.