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Isl1/Nkx2.1 expression in the hypothalamus of Protopterus dolloi. Photomicrographs of sagittal (A,B) and transverse (C–G) sections through the hypothalamus of Protopterus dolloi. The cells stained for Isl1 and Nkx2.1 in the basal hypothalamus are largely intermingled and extend into the posterior tubercle (TP), which in this species shows a dorsal ventricular recess (RID). Scale bars = 500 μm (A–F), 100 (B) and 200 μm (G–I). See list for abbreviation.
