The front cover shows a schematic diagram of a putative endometrial epithelial stem cell niche showing an estrogen receptor (ER-α) negative epithelial stem cell receiving indirect proliferative signals from surrounding ER-α positive mesenchymal cell. Above are confocal images showing mouse endometrial epithelial cells double labelled for ER-α (green) and post-natal BrdU label (red). A single label-retaining (non-dividing) cell lacking co-expression of ER-α is indicated by the arrows. The evidence for uterine stem cells is discussed (see C.E.Gargett, pp. 87–101).
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