Lymphocytes carry the immune response. This
was shown by the following experiment. The
normal immune response of a mouse to an administered
antigen (foreign organism, foreign
molecular structure) was destroyed by a high
dose of X-irradiation, to which the immune system
is especially sensitive. The immune response
was then restored by lymphocytes of a
genetically identical (from an inbred strain)
unirradiated mouse, but not by any other cells.
Other cells are ineffective since only lymphocytes
produce an immune response.
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