. "Combining with an MHC class Ib protein complex and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. Class Ib here refers to non-classical class I molecules, such as those of the CD1 or HLA-E gene families." . . "T cell receptor activity" . "alpha-beta T cell receptor activity" . "gamma-delta T cell receptor activity" . "MHC class Ib receptor activity" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .