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Spermatogenesis is a self-renewing process leading to production of spermatozoa in adult testis. The existence of male germinal stem cells was demonstrated by regeneration of spermatogenesis after transplantation of total testicular germ cells in testis [1], and we have previously shown that mouse testicular cells contain a side population (SP) of stem cells (Hoechst 33342 fluorescent dye efflux) that can repopulate germ celldepleted testis when transplanted into adult mice [2]. Several breakthroughs concerning the in vitro derivation of male and female germ cells from embryonic stem cells have challenged the field of reproductive biology and opened new perspectives for treatment of infertility [3–5]. Some reports have suggested that adult bone marrow-derived stem cells are able to regenerate various nonhematopoietic cell lineages in several organs, by

Bone Marrow‐Derived Stem Cells Do Not Reconstitute Spermatogenesis In Vivo