No new information in Greencastle woman's disappearance. No new information in Greencastle woman's disappearanceThere was still no word Tuesday night on the whereabouts of Julie McCutcheon, the Greencastle woman who went missing a week ago while house-sitting for a friend in Gettysburg.
Medical Definition of ANTIGEN. : any substance (as an immunogen or a hapten) foreign to the body that evokes an immune response either alone or after forming a complex with a larger molecule (as a protein) and that is capable of binding with a product (as an antibody or T cell) of the immune response.â anÂ·tiÂ·genÂ·ic \Ëan-ti-Ëje-nik\ adjective.edical Definition of ANTIGEN. : any substance (as an immunogen or a hapten) foreign to the body that evokes an immune response either alone or after forming a complex with a larger molecule (as a protein) and that is capable of binding with a product (as an antibody or T cell) of the immune response.
An antigen is a substance that can invoke an immune response. While an antibody is the immune system's response to an antigen. Antibodies, act by directly neutralizing the antâ¦igen and/or bind to the antigen and signaling marcophages to phagocytose the antigen.