A heart attack happens when blood flow to the heart suddenly. becomes blocked and the heart canât get oxygen. quickly, the heart muscle fails to pump and begins to die. disease (CHD), also called coronary artery disease.
The B-cell receptor is composed of two parts: i) A membrane-bound immunoglobulin molecule of one isotype (IgD, IgM, IgA or IgE).he B-cell receptor is composed of two parts: i) A membrane-bound immunoglobulin molecule of one isotype (IgD, IgM, IgA or IgE).
Functions of membrane and secreted IgD. The reason why mature B cells express two IgM and IgD receptors remains unclear. One line of thought is that IgM and IgD deliver qualitatively different signals. Consistent with this possibility, IgM and IgD associate with distinct B cell receptor-associated proteins (BAPs) [6].