Principle
Clonal Selection Theory
Specific antigen receptors exist on lymphocytes before the antigen is presented; the antigen selects the cell with the proper receptor and induces it to proliferate.
Immunology
Field: Immunology
Sequence of Expressions
Hypothesis
Hygiene Hypothesis
Lack of early childhood exposure to infectious agents, symbiotic microorganisms, and parasites increases susceptibility to allergic diseases by suppressing the natural development of the immune system.