has_part has part has part transmembrane signaling receptor activity MHC class Ib protein binding MHC class Ib receptor activity GO:0032394 gamma-delta T cell receptor activity T cell receptor activity 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. alpha-beta T cell receptor activity Note that this term is intended for annotation of gene products that act as receptors for MHC class Ib protein complexes, not for components of the MHC class Ib protein complexes themselves. molecular_function immune receptor activity