Page 555 - Veterinary Immunology, 10th Edition

TCR, co-stimulatory molecules, and cytokines such as IL-2, -12, -21,
VetBooks.ir and -27. These activated cells migrate to peripheral sites and

differentiate into effector and memory cells. Short-lived effector
cells form the bulk of the population and will mostly die once

infections are cleared. Cells that may have received less stimulation
survive and become long-lived memory cells. The differentiation
into these two cell populations is probably due to asymmetric cell
division.

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