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a & b: A Photomicrograph of a section in thyroid gland of a TBT-treated rat (group II). It reveals extensive vacuolated colloid (Co) filling the follicular lumen. Most of the follicular cells appear swollen and vacuolated (∆), while others show loss of their nuclei (▲). The other follicle is lined by multiple layers of follicular cells (↑). A small follicle with narrow lumen (thick ↑) can also be seen. A nearby congested blood capillary (bc) is observed. H&E stain. Mic.Mag. X 400
