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Haematoxylin-Eosin. Thymuses from 12 day-old embryos. (a) Normal thymus. Note the division in cortex (C) and medulla (M). (b) Normal thymus. Small epithelial clusters with few cells (arrow), in the medulla. (c) PD thymus. Note the reduction of the thymic size. (d) PD thymus, in the medulla no epithelial cells are present. Scale bar: a,c: 200 µm; b: 40 µm; d: 16 µm.
