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Detection of F-actin in spermatozoa. Spermatozoa were stained with rhodamine phalloidin and photographed by fluorescence microscopy. (A) Spermatozoan from a wild-type mouse. The entire spermatozoan is stained, but the level of staining is highest in the middle piece. (B) Spermatozoan from a nectin-2−/− mouse. Staining is predominantly in the head.
