antigen binding (GO:0003823)

Interacting selectively and non-covalently with an antigen any substance which is capable of inducing a specific immune response and of reacting with the products of that response the specific antibody or specifically sensitized T-lymphocytes or both. Binding may counteract the biological activity of the antigen.

Specific

lipid antigen binding (GO:0030882) MHC protein complex binding (GO:0023023) peptide antigen binding (GO:0042605) protein antigen binding (GO:1990405)

References

gene ontology: GO:0003823