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Immunostaining of testis of different ages in Datong yak. Immunostaining analysis indicated that IZUMO1 is expressed in all ages but positive germ cells (red arrow) are more prominent in the tubules of 30 months and 6 years yak testis compared to 6 months and 18 months. (A) 6 months of Datong yak. (B) 18 months of Datong yak. (C) 30 months of Datong yak. (D) 6 years of Datong yak.
