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Created page with "==Key Stage 4== ===Meaning=== An antigen is a protein usually found on the cell membrane of a cell or the surface of a virus...."
==Key Stage 4==
===Meaning===
An [[antigen]] is a [[protein]] usually found on the [[Cell Membrane|cell membrane]] of a [[Cell (Biology)|cell]] or the surface of a [[virus]].
===About Antigens===
: [[Antigens]] 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]].
===Meaning===
An [[antigen]] is a [[protein]] usually found on the [[Cell Membrane|cell membrane]] of a [[Cell (Biology)|cell]] or the surface of a [[virus]].
===About Antigens===
: [[Antigens]] 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]].