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Figure Caption
Fig. 3 Histological development of zebrafish thymus. (A) Thymic primordium 54 hr after fertilization. Thymus at B, 84 hr; C, 90 hr; and D, 2 weeks. The diagram above each photograph shows its location and the sketch below identifies the organs. Photos A, B, and D are of paraffin sections stained with hematoxylin and eosin Y. Photo C is of a plastic section stained with toluidine blue. B, brain; Ca, cartilage; GA, gill arches; H, heart; I, intestine; M, muscle; O, otic vesicle; T, thymus.
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Reprinted from Developmental Biology, 182(2), Willett, C.E., Zapata, A.G., Hopkins, N.A., and Steiner, L.A., Expression of zebrafish rag genes during early development identifies the thymus, 331-341, Copyright (1997) with permission from Elsevier. Full text @ Dev. Biol.