User-defined cell-surface antigen

The term User-defined cell-surface antigen does not refer to a specific biological molecule, protein, or receptor. Instead, it is a generic placeholder or descriptive phrase used in biotechnology and synthetic biology to describe a target that is selected by a researcher for a specific application, such as in the development of modular CAR-T cell therapies or bispecific antibodies. In these systems, the therapeutic agent is often designed with a universal docking mechanism that can be redirected toward any cell-surface protein (the user-defined antigen) by using a specific adapter or switch molecule. Because it is a functional description rather than a distinct entity, it lacks a unique UniProt ID, specific biological pathway, or established clinical profile. Consequently, it cannot be classified as a therapeutic target in the traditional sense.

Not applicable