What about IGD? Well, immunoglobulin Deed are those antigens that are basically also found on the B lymphocytes, and they play a role in actually creating our antibodies. So they help us differentiate our B lymphocytes into plasma cells. And those plasma cells ultimately produce those antibodies that are essentially complementary to the antigens that bind onto these immunoglobulin D types. And finally, we have immunoglobulin A. So immunoglobulin A are those antibodies that are found inside our nasal cavities, inside our air passageways.