Spermatidogenesis is the creation of

spermatid The spermatid is the haploid male gametid that results from division of secondary spermatocytes. As a result of meiosis, each spermatid contains only half of the genetic material present in the original primary spermatocyte. Spermatids are co ...

s from secondary spermatocytes during

spermatogenesis Spermatogenesis is the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testicle. This process starts with the Mitosis, mitotic division of the stem cells located close to the basement membrane of ...

. Secondary spermatocytes produced earlier rapidly enter '' meiosis II'' and divide to produce haploid

s. The brevity of this stage means that secondary spermatocytes are rarely seen in

histological Histology, also known as microscopic anatomy or microanatomy, is the branch of biology that studies the microscopic anatomy of biological tissue (biology), tissues. Histology is the microscopic counterpart to gross anatomy, which looks at large ...

preparations. Mouse

stem cells In multicellular organisms, stem cells are undifferentiated or partially differentiated cells that can change into various types of cells and proliferate indefinitely to produce more of the same stem cell. They are the earliest type of cell ...

were grown into cells resembling spermatids in 2016. These spermatids, when injected into mouse eggs, were able to produce pups.

References

Mammal male reproductive system {{Cell-biology-stub ru:Сперматогенез