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Thyroid follicles from control (a and d), T3- (b and e) and T4-treated rats (c and f), paraffin (a–c, hematoxyline/eosin) and plastic (d–f, toluidine-blue) embedded sections. Note thinning of the interfollicular barrier (arrowheads in c, e and f) and desquamated thyrocytes within the follicular lumen (asterisk in c). Bar 10 μm (a–c) and 4 μm (d–f).
