J. Klein

P. H. Hofschneider

W. Arber

W. Henle

F. Melchers

J. H. Humphrey

P. Koldovský

H. Koprowski

O. Maaløe

R. Rott

H. G. Schweiger

L. Syru?ek

P. K. Vogt

Volume 79

Current Topics in Microbiology and Immunology

Volume 80

N. K. Jerne

M. Sela

R. Haas

E. Wecker

Volume 65

Current Topics in Microbiology and Immunology / Ergebnisse der Mikrobiologie und Immunitätsforschung

Volume 68

Expression of an immune response is the net result of complex synergisƯ tic and antagonistic activities performed by a variety of cell types. It includes macrophages, T and B populations which may interact in performance of a response, and suppressor cells interfering with it. Accordingly, a lack of resƯ ponse may not necessarily indicate absence of immunocompetent cells, but rather nonexpression of competence. Thus, one should consider two possible situations, which are by no means mutually exclusive, to account for immunoƯ logic unresponsiveness: (a) one or more of the cell populations composing the synergistic unit is absent or immature, and (b) an antagonistic unit which interferes with the response is dominating. In view of this, an approach to development of immune reactivity necessitates parallel surveys of development of cells with the potential to perform, as well as of cells which can suppress the response. Classification of the various cell types has been based so far on their phenotypic properties (e. g., membrane antigen markers, cell receptors, proƯ duction and secretion of immunoglobulins, etc.). Genotypically, T and B cells may represent either separate, independent cell lines, or different stages of development within the same cell lineage.

Volume 73

J. H. Humphrey

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