The following points highlight the two main types of organs present in immune system of humans. The types are: 1. Primary Lymphoid Organs 2. Secondary Lymphoid Organs. Type # 1. Primary Lymphoid Organs: Primary lymphoid organs (PLO) are the major sites of lymphocyte development i.e. lymphopoiesis. Lymphocytes differentiate from lymphoid stem cells, proliferate and mature into functional cells called immuno-competent [...]
In this article we will discuss about the classification of immunoglobulin. 1. Isotypes: Based on the structure and sequence of their heavy-chain, constant regions, immunoglobulins are divided into five major groups called as classes which are again further subdivided into subclasses. In human, for example, there are five classes of immunoglobulins (commonly called GADME) viz., IgG, IgA, IgD, IgM [...]
In this article we will discuss about: 1. Meaning of Antigens 2. Nature of Antigens 3. Classification 4. Features 5. Factors. Meaning of Antigens: Classically, an antigen is defined as an organism, a molecule, or part of a molecule or substance which may be self or non-self, can evoke noticeable immune response and can bound distinctively with antibodies. Antigenicity is [...]