From The School of Biomedical Sciences Wiki
Antigen receptors are located on B and T lymphocytes. Each of these cells have thousands of receptors with varied specificities - they have a binding site for particular epitopes.
T cell receptors (TCRs) bind to and respond to epitopes on the antigen presenting cell.
B cell receptors (BCRs) respond to epitopes on a soluble antigen surface. B cells release antibodies that then bind to these soluble antigens.
- ↑ http://www.biology-pages.info/A/AntigenReceptors.html