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The problem that virtually all cells have in discriminating between
"self" and "non-self" molecules and cells has been considered at
great length in immuno biology. However, cells that clearly are
incapable of carrying out mammalian type immune functions can
exhibit exquisite specificity in their capacity to discriminate
among syngeneic, allogeneic, and xenogeneic cells. In this volume
of Contemporary Topics in Immunobiology we have chosen to consider
the general problem of self/non-self discrimination as it is
manifest in recognition reactions of plants and invertebrates and
in the evolutionary development of the immune response of
vertebrates. A broad, many-faceted approach is taken toward
fundamental issues in immunobiology in order to develop innovative
concepts of receptor function as well as to delineate traditional
views. The capacity of plants to discriminate between self and
non-self is addressed in Chapter 1 by R. B. Knox and Adrienne E.
Clarke. These authors provide examples of cell-cell recognition in
plants that parallel those occurring in in vertebrates and
vertebrates. In general, tolerance (acceptance) of grafts is re
stricted to plants within closely related genera. Recognition is
mediated by callus cells, which proliferate at wound surfaces in
higher plants, and there is a correlation between cell and tissue
type and antigenic markers detectable with the use of mammalian
antibodies. Certain flowering plants exhibit precise discrimination
in fertilization, when pollen must be from the same species, but
fertilization occurs only if the pollen is genetically non-self."
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