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.
It is encoded in the HIV genome as one long protein, which is called gp160 (gp is short for glycoprotein). Then, as it is transported to the infected cell's surface, the many carbohydrates are added and it is cleaved into two pieces, called gp120 and gp41. Then, it is incorporated into the virus as it buds from the cell surface.