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Three trained observers reviewed each stallion's histology slides by quantifying the number of spermatids within 25 cross-sectioned round seminiferous tubules.
These haploid cells - now called spermatids - thus contain 23 single half chromosomes.
The hypothesis was confirmed in experiments using phase-contrast microscopy, which showed the presence of individualized spermatids in the mutant testes.
Rates of protein evolution were fastest for genes expressed during the dramatic morphogenesis of round spermatids into spermatozoa.
Spermatocytes, the progenitors of spermatids , are biosynthetically active cells, producing all the components that will be needed in the mature spermatozoa.
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