Thyroxine-binding globulin is
a. a transport protein in the blood plasma.
b. a colloid found in the thyroid follicles.
c. a receptor for T4 found in its target cell nuclei.
d. a releasing factor that stimulates secretion of thyroxine.
e. a receptor for T4 found in its target cell plasma membranes.
Answer: a. a transport protein in the blood plasma.
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