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Both haploid and diploid spermatids from XESxrbO male mice are elongating. Spread cells from XY and XESxrbO testis stained by DNA FISH with autosomal probes for either Kcnq1 or Airn. In XY males, for both probes, haploid elongated spermatids display a single DNA FISH spot whereas spermatogonia show two spots characteristic of diploid cells. In XESxrbO testis, haploid (one spot) and diploid (two spots) spermatids are elongating.
