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Immune system.
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Immune system has progressed evolutionally, that is, by adapting to certain changes and also inculcating the change to the next generation.
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So the two important cells that are present as a part of immune system are the b cells and the other one shall be the t cells.
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So both of these cells would come under the category of adaptive immunity.
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That is, it is a last network or the last line of difference.
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That is possessed by a human species.
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So this adaptive immunity in turn, it is possessed or framed by certain characteristic, like being specific to a particular type of pathogen, and also it will eliminate the particular pathogen very quickly from the body by being specific in nature.
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So these are in turn achieved by two different classes, that is, b cells are cells which in turn are known to produce antibodies.
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And these antibodies are the ones which will have different function...