Define the CD and MHC molecules.

CD (cluster of differentiation) molecules and MHC (major histocompatibility complex) molecules are essential components of the immune system in mammals. In this article, we will define these molecules, discuss their roles in the immune system, and highlight some of their subtypes and functions.

CD molecules are a family of cell surface markers that are used to classify and identify different types of immune cells. They are proteins that are expressed on the surface of T cells, B cells, macrophages, and other immune cells. CD molecules are named after the monoclonal antibodies that were used to initially identify them. There are over 350 different CD molecules that have been identified, and each has a unique function in the immune system.

The main function of CD molecules is to mediate cell-cell interactions and signal transduction between different immune cells. They do this by binding to other CD molecules or to ligands on the surface of other ___ _________ _______ _____ ___ ___.
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