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.
Introduction. Natural killer (NK) cells are a sophisticated cell of the innate immune system with the capacity to kill cells and produce cytokines through the interaction of a variety of cell surface receptors with their cognate ligands.K cell surface receptors regulating effector function. Natural killer cells express a number of receptors that activate or inhibit effector function. These receptors belong to either the Ig-superfamily of type I membrane proteins (Table 1) or the C-type lectin superfamily of type II membrane proteins (Table 2).