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===About Antigens===
: [[AntigensAntigen]] s act as locations where certain [[chemical]]s can interact with a [[Cell (Biology)|cell]].
: Some [[antigen]]s are receptor sites where [[hormone]]s bind in order to change the behaviour of a [[Cell (Biology)|cell]].
: Some [[antigen]]s are locations where a [[chemical]] will bind in order to be taken into the [[Cell (Biology)|cell]].