This review summarizes some important data, principles, opinions, commentaries, and modern methodology concerning the receptor structure, interactions, signaling and receptor-mediated cell functions. Three sections give a brief overview of the signaling synergy, multivariant signaling, and some reactions in phosphorylation networks. A concise report about the cytotoxic reaction of NK cells represents an example of multistage recognition reaction, involving differently acting receptors, changes in affinities of cell-cell interactions, and secretion of regulatory and cytotoxic molecules. Some interesting trends in receptor engineering, including antibody molecules as a special receptor phenomenon are mentioned in the final section.

Department of Immunology Czech Academy of Sciences Prague Czech Republic

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