In third and fourth pharyngeal pouch, thymus helper T cells secrete peptides {lymphokine}, such as interleukin, interferon, colony-stimulating factor, and tumor necrosis factor. Lymphokines activate cytotoxic T cells, signal B cells to make antibodies, attract macrophages and platelets with chemotactic factors, multiply helper T cells, and multiply immune precursor cells.
Helper T cells secrete lymphokine peptides, such as interleukin, interferon, colony-stimulating factor, and tumor necrosis factor. Lymphokines activate cytotoxic T cells, signal B cells to make antibodies, attract macrophages and platelets {chemotactic factor}, multiply helper T cells, and multiply immune precursor cells.
4-Zoology-Organ-Immune System-Protein
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Date Modified: 2022.0225