An protein (Ab), additionally called Associate in Nursing immune globulin (Ig), could be a massive, Y-shaped supermolecule created principally by plasma cells that's employed by the system to neutralize pathogens like morbific microorganism and viruses. The protein acknowledges a singular molecule of the infectious agent, known as Associate in Nursing matter, via the fragment antigen-binding (Fab) variable region. every tip of the "Y" of Associate in Nursing protein contains a paratope (analogous to a lock) that's specific for one specific epitope (analogous to a key) on Associate in Nursing matter, permitting these 2 structures to bind at the side of preciseness. victimisation this binding mechanism, Associate in Nursing protein will tag a microorganism or Associate in Nursing infected cell for attack by alternative elements of the system, or will neutralize its target directly (for example, by inhibiting a region of a microorganism that's essential for its invasion and survival). reckoning on the matter, the binding could impede the organic process inflicting the malady or could activate macrophages to destroy the foreign substance. the flexibility of Associate in Nursing protein to speak with the opposite elements of the system is mediate via its Fc region (located at the bottom of the "Y"), that contains a preserved glycosylation web site concerned in these interactions the assembly of antibodies is that the main perform of the body substance system.

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