The Conrad laboratory is involved in studies of the basic mechanisms of IgE-mediated allergic disease. Special attention is paid to cell surface receptors for IgE. Two general classes of these receptors are known to exist; the first, known as Fce RI, has a very high affinity for IgE and is found exclusively on mast cells and basophils. Crosslinking of FceRI causes these cells to release the mediators that cause allergy; however, the biochemical mechanisms of this mediator release process are poorly understood.