Evolution of the immune system

Len Adleman adleman at pollux.usc.edu
Fri Dec 4 15:08:37 EST 1992

Is there information regarding the evolution of T cells?  For example:
are there species with T cells (i.e. CD3+ analogues) but without
T4 cells (i.e. CD3+CD4+CD8- analogues) and/or without T8 cells
(i.e. CD3+CD8+CD4- analogues)?

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