part of develops from start stage end stage immune system mononuclear phagocyte professional antigen presenting cell macrophage A mononuclear phagocyte present in variety of tissues, typically differentiated from monocytes, capable of phagocytosing a variety of extracellular particulate material, including immune complexes, microorganisms, and dead cells. histiocyte ZFA:0009141 zebrafish_anatomy CL:0000235 TAO:0009141 monocyte segmentation:10-13 somites adult