The Major Groups of Coelurosaurs. Extremely bird-like theropod dinosaurs. Warning: You are entering an area of taxonomic research that is constantly changing. The phylogeny of this group of theropods is debated by paleontologists involved in its study, and new classifications are proposed several times a year! We will attempt to keep this site updated, but for now, as you warily maneuver through the shadowy byways of this theropod exhibit, remember that the relationships of this diverse group are not yet understood fully. It is both a frustrating and exciting area of research. So tread carefully from here onâ¦and watch the shadows!
What It Is. An IgA test measures the blood level of immunoglobulin A, one of the most common antibodies in the body. Antibodies are proteins made by the immune system to fight bacteria, viruses, and toxins.IgA is found in high concentrations in the body's mucous membranes, particularly the respiratory passages and gastrointestinal tract, as well as in saliva and tears. IgA also plays a role in allergic reactions.ntibodies are proteins made by the immune system to fight bacteria, viruses, and toxins. IgA is found in high concentrations in the body's mucous membranes, particularly the respiratory passages and gastrointestinal tract, as well as in saliva and tears.
IgA. Immunoglobulin A (IgA, also referred to as sIgA) is an antibody that plays a critical role in mucosal immunity. More IgA is produced in mucosal linings than all other types of antibody combined; between three and five grams are secreted into the intestinal lumen each day.This accumulates up to 15% of the total immunoglobulin produced in the entire body.he high prevalence of IgA in mucosal areas is a result of a cooperation between plasma cells that produce polymeric IgA (pIgA), and mucosal epithelial cells that express an immunoglobulin receptor called the polymeric Ig receptor (pIgR).