Rhombus - Area. 1  As for all parallelograms, the area K of a rhombus is the product of its base and its height (h). 2  The area can also be expressed as the base squared times the sine of any angle... 3  or in terms of the height and a vertex angle... 4  or as half the product of the diagonals p, q...
Helper T cells augment the immune response by recognizing the presence of a foreign antigen and then stimulating antibody production and producing cytokines that âturn onâ or activate other T cells. Regulatory T cells function in an opposite manner: they dampen or turn off the immune response.
The CD4 cells (also called T-helper cells) are an important part of the immune system because they fight germs and infections. HIV attacks CD4 cells and reduces the number of them in your body. Without treatment, HIV slowly weakens the immune system, making it harder for your body to fight off illness or infection.