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SR-SIM of epithelial tubules in the intra-osseous part of the ES. (A) Several IBA1-positive cells are present in the epithelium and seem to constitute an integral part of the epithelium. The cells express MHCII. Large endocytic vesicles (arrow) express MHCII. (B) The framed area of the inset is shown under a higher magnification; some epithelial cells express IBA1 as well as MHCII (arrow).
