Assertion: immune system's cell | /r/HasProperty | cell
Facets:
Source sentences:
text: When tissue grafts are made in animals higher up the evolutionary tree—between individual annelid worms or starfish , for example—the foreign tissue is commonly invaded by phagocytic cells (cells that engulf and destroy foreign material) and cells resembling lymphocytes (white blood cells of the immune system), and it is destroyed.
text: Other immune cells, called natural killer (NK) cells, play a special role in this case, however, because they notice when body cells no longer have present specific 'self' proteins on their surface and kill the abnormal cells.
text: G. Plasma Cells: These cells develop from B-cells and are the cells that make immunoglobulin for the serum and the secretions.