"In vivo" and "in vitro" morphological analysis of associations of cells ("rosettes") involved in immune response in human tumoral effusions revealed the existence of cell interactions either by simple membrane apposition between the cell projections or by gap-like junctions between two adjacent cells; endocytotic phenomena were also observed. The giant fibroblastic cells seen "in vitro" ("myofibronoblasts") reacting positively to anti-human macrophage Mabs, might be the cells presenting antigen to lymphocytes.
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