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Morphology of Fyn-null oocytes. Oocytes recovered from wild-type (WT) B6;129SF2/J and Fyn-null B6;129S7-Fyntm1Sor/J (Fyn−/−) mice were examined by Hoffman modulation contrast. The Fyn-null oocytes contained dense, irregular inclusions. The diameter of the two groups of oocytes did not differ significantly (P = 0.563); however, the thickness of the zona pellucida of Fyn-null oocytes was significantly less than that of WT oocytes (P < 0.001). Scale bar = 50 mm.
