Question

@riya - 5 me kya jata ae tera? -,-
Daani ban xD
@krish - Are de dega pyaar se bolenge to xD​

Answer 1

In immunology, an antigen is a molecule or molecular structure, such as may be present on the outside of a pathogen, that can be bound by an antigen-specific antibody or B-cell antigen receptor. The presence of antigens in the body normally triggers an immune response.

Accha vese v Riya mese pyaar krta h xD -,-"