Fig. 2. Extracellular ligand recognition domains of CARs.
a) Single domain variable antibody fragments, b) Fab, c) natural ligands like cytokines and receptors, d) B cell receptor ligands, e) TCR ligands. scFv, single chain variable fragment; Fab, fragment antigen binding; TCR, T cell receptor; MHC, major histocompatibility complex. * IL-13, FcεRI, Ly49H, $ Egg lysozyme, Desmoglein-3, factor VIII.