1 Most of these diseases are infections, caused by a variety of bacteria, viruses, and parasites that can be foodborne. 2  Other diseases are poisonings, caused by harmful toxins or chemicals that have contaminated the food, for example, poisonous mushrooms.
(cluster designation 4) symbol for a glycoprotein expressed on the surface of helper T lymphocytes and other immune cells. CD4 serves as a receptor for human immunodeficiency virus envelope glycoprotein gp120.
Some carbohydrate moieties enter into immune reactions. Glycoproteins on the cell surface play a key role in the bodyâs immune response. An example with which you might be familiar is the ABO blood groups, which are determined by the number and composition of sugars attached to membrane sphingolipids.