. "\"Interacting selectively and non-covalently with major histocompatibility complex class II molecules; a set of molecules displayed on cell surfaces that are responsible for lymphocyte recognition and antigen presentation.\" [GOC:jl]" . . "MHC class II protein binding" . "major histocompatibility complex class II binding" . "Note that this term does not include binding to the antigen peptide bound to the MHC protein. Consider also annotating to the molecular function term 'peptide antigen binding ; GO:0042605' or one of its children." . . "major histocompatibility complex class II ligand" .