The front cover shows tissues from a normal woman and a woman with endometriosis (both eutopic and ectopic endometrium) at day 26 of the menstrual cycle double labelled for Interleukin Receptor 1 (ILR1,green) and Interleukin Receptor 2 (ILR2 red). Staining for ILR2 is markedly less intense in both tissue specimens from endometriotic women. See Akoum et al., pp. 1464-1473.
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