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The greater RA synthesizing capacity of M2 versus CD14+CD163-ve (M1) cells was confirmed by direct quantitation of RA biosynthesis from retinol. RA levels in whole decidua were correlated with M2 cell density but not with stromal cell (CD10+) number, the major cell type comprising the decidua. These results identified M2 monocyte/macrophages as the primary source of RA in human term decidua. This finding may have implications for certain pregnancy complications that are known to be associated with reduced numbers of decidual M2 cells.E