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transporter that utilises the concentration gradient of Na⁺ to move I^- against its concentration gradient.
# I^- is moved across the apical membrane into the colloid of the follicle.
# Thyroperoxidase oxidises I^- to form the I radical.
# The thyroperoxidase iodinates the tyrosyl residues of the thyroglobulin within the colloid. The thyroglobulin was synthesised in the ER of the follicular cell and secreted

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