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Figure 6-47.
Embryonic thymus. (A, B) Hematoxylin and eosin-stained transverse cryosection of a stage 37 embryo. The thymus is located anterior to the pectoral fin and appears as a dense distribution of hematoxylin-rich lymphocytes. The area inside the red rectangle in A is enlarged in B. (C, D) Stage 37 embryo subjected to in situ hybridization using the immature lymphocyte-specific rag1 probe. (C) Ventral view; (D) lateral view. (Iwanami N. and Takahama Y. Cell Technology (2004) 23, 45–48, in Japanese.)