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A Barr body is the inactivated X chromosome that is usually found in the nuclei of female somatic cells. It can also occur in males when there is an abnormality and the male is XXY instead of the normal XY, a condition known as Klinefelter's syndrome.
When an antigen enters the body or tries to enter the body, the immune system is triggered. Chemical signals are sent to alert all the different parts of the immune system into action. First, the B cell meets the antigen. The B cell will create the antibody protein and stick it to the antigen.