Macrophage in contact with a lymphocyte. False- colour scanning electron micrograph (SEM) of a macrophage (gold) in contact with a lymphocyte, a type of white blood cell. The macrophage's irregular shape is characterised by thin projections (filopodia), used for support & motility. Macrophages form part of the body's reticulo-endothelial (or macrophage-monocyte system), which includes those cells & tissues with phagocytic (digestive-like) properties. Macrophages engulf & digest cellular debris, bacteria, other foreign bodies & aged red cells. Magnification unknown.