N.K. cell and cytotoxic cells are differentiated by ?
Interferons reduce N.K. cell activity
Antibody specificity
Receptor for IgG
Presence in spleen
Ans. is 'b' i.e., Antibody specificity . Cytotoxicity of NK cells is not antibody dependent or MHC restricted, while cytotoxic cells are capable of lysing or killing target cells sensitized with antibody.