果蠅的mago-nashi（無孫）基因突變產生的后代在種質組合和種系發育方面存在缺陷這個基因編碼哺乳動物的mago-nashi同源基因在哺乳動物中，mRNA的表達并不局限于原生質，而是在成體組織中廣泛表達，可通過血清刺激靜止成纖維細胞誘導表達[由RefSeq提供，2008年7月]
Drosophila that have mutations in their mago nashi (grandchildless) gene produce progeny with defects in germplasm assembly and germline development. This gene encodes the mammalian mago nashi homolog. In mammals, mRNA expression is not limited to the germ plasm, but is expressed ubiquitously in adult tissues and can be induced by serum stimulation of quiescent fibroblasts. [provided by RefSeq, Jul 2008]