A ==Key Stage 3=====Meaning===An [[antibody]] is a [[chemical]] made by [[white blood cells]] that help fight [[infection]]. ==Key Stage 4=====Meaning===An [[antibody]] is a [[chemical]] made by [[lymphocyte]]s that is used to fight [[pathogen]]s. ===About Antibodies===: Some '''antibodies''' can directly damage or destroy a [[pathogen]].: Some '''antibodies''' attach themselves to [[pathogen]]s to make it easier for [[phagocyte]]s to engulf and destroy them. They act like tags to tell the [[phagocyte]]s which [[Cell (Biology)|cells]] to attack.