Examlex
Which of the following is NOT one of the four main reasons given for the persistence of trade barriers?
Helper T Cell
Subset of T lymphocytes that increases the activity of B cells and T cells.
Cytokines
Small proteins released by cells, especially in the immune system, that have a specific effect on interactions and communications between cells.
Effector T Cells
A type of T cell that actively responds to a pathogen by directly killing infected host cells or by signaling other immune responses.
Lymphatic Trunks
These are large lymphatic vessels that drain lymph from different parts of the body into the bloodstream.
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