FIGURE 2 | Germline and somatic stem cells and their niches in the Drosophila testis.
From the following article:
The stem-cell niche theory: lessons from flies
Haifan Lin
Nature Reviews Genetics 3, 931-940 (December 2002)
doi:10.1038/nrg952
The apical tip of the Drosophila testis, showing only 2 out of 5–9 germline stem cells (GSCs) with their two flanking somatic stem cells (SSCs). The diagram also shows the four synchronous divisions of the gonialblast (GB): incomplete cytokinesis generates 16 interconnected spermatogonia that are encased by the two somatic cyst cells.
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