Thymus bldies prominently increased in quantity. 胸腺小體數量增多。
The thymus has no obvious demarcation into an outer cortex and inner cortex.Lymphocytes and the macrophages are dispersed in the thymus parenchyma equably. 牙鮃胸腺沒有明顯的外區和內區之分，胸腺細胞和巨噬細胞比較均勻地分佈於整個組織中，未能觀察到胸腺小體。
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