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(a) Capsular fibrous thickening without inflammation at week 10 in a rat treated with sulfadimethoxine and aminoguanidine following N‐bis(2‐hydroxypropyl)nitrosamine‐initiation. (b) Similar lesion as (a) at week 10 in a rat treated with sulfadimethoxine following N‐bis(2‐hydroxypropyl)nitrosamine‐initiation. (c) Normally appearing thyroid capsule at week 10 in a non‐treated control rat. H&E. Original magnification ×90.
