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.
1 Helper T-cells (CD4+) are middlemen in the immune response. 2  When they get activated, they proliferate and secrete cytokines that regulate or help effector lymphocyte function. 3  They are known as one of the targets of HIV infection, and the decrease of CD4+ T-cells results in AIDS.