Exocytosis

Thyro-

globulin

Pendrin

Tyrosyl residue

lodination

— ТРО

H202

TSH (cAMP)

H202 generator

Stored forms

0г

Endocytosis of iodinated

thyroglobulin

See

Fig. 25.2

Triiodotyrosine

- ОН

Follicular cell

Colloid

Tetratyrosine

ОН

Monoiodotyrosine

(MIT)

Diiodotyrosine

(DIT)

Coupling

#T4

#T3