Definition: Antigen, in genetics, refers to genetic material carried by a certain cell or organism, typically within a host organism (such as a human). It describes a small piece of DNA that is passed along from one generation to another through a process called replication. The term 'antigenically' implies the presence of specific components of the antigen within the cells. This can be useful for understanding the immune response to an organism, where certain types of antigens might trigger an immune response.
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