| INTERFERON | Natural protein produced by the cells of the immune system of most vertebrates in response to challenges such as viruses, parasites and tumour cells |
| OVARY | Female reproductive organ in humans and other vertebrates in which eggs are produced (5) |
| CHOLESTEROL | A waxy, fat-like substance found in the cells of the body (11) |
| THAUMATINB | A natural protein bait sweetener (*man hit a tub!) (9,1) |
| TEETH | Set of hard, bony, enamel-coated structures in the jaws of most vertebrates used for biting and chewing |
| PELVIS | Funnel-shaped structure at the lower end of the trunk of most vertebrates (6) |
| VOMER | A bone in the skull of most vertebrates (5) |
| ANTIBODY | A protective protein produced by the immune system in response to a foreign substance (8) |
| RENIN | Enzyme secreted by the juxtaglomerular cells of the kidneys to regulate the body's blood pressure and fluid balance (5) |
| ANTIBODIES | Proteins produced in the blood in response to the presence of antigens (10) |
| ACROSS | Of or relating to the cells of a crossword to be filled horizontally (6) |
| OPSONIN | What are proteins that attach to the outside of cells of phagocytes to flag to the body that the cells should be eaten or destroyed? (7) |
| ENZYME | Complex protein produced by living cells that acts as a catalyst in biochemical reactions, as in digestive systems (6) |
| GLIA | Non-neuronal tissue that surrounds and supports the nerve cells of the central nervous system; Greek, 'glue' (4) |
| HISTAMINE | Inflammatory secretion of the immune system first described by British scientists Henry H. Dale and P. P. Laidlaw in 1910 (9) |
| NUMBERS | Digits to be pencilled into the cells of sudoku grids; an informal word for admired or stylish articles of clothing; or, arithmetical symbols used as concepts of quantity (7) |
| IG | A class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the i |
| ATP | The abbreviation for adenosine triphosphate, found in the cells of all living things. |
| ALLERGY | What is a reaction of the immune system to a specific food or substance? (7) |
| TCELL | A part of the immune system that helps to fight infection (1,4) |
