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Present the role of vitamin A in the immune system.
Upper Respiratory Tract
The section of the respiratory system comprising the nose, nasal passages, pharynx, and larynx that filters, warms, and moistens air during breathing.
Closely Associated
Having a close relationship or connection in terms of location, function, or characteristics.
Similar Cells
Cells that share common characteristics or functions, often grouped together to form tissues in multicellular organisms.
Adipose Tissue
Tissue in which fat is stored.
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