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Fig. 2 Distribution of catecholaminergic (TH) and Otpa-positive cells in the adult zebrafish forebrain I. Based on DAPI stains, epifluorescence microscopic analysis of immunostained transverse sections shows no cellular colocalization of TH and Otpa in these forebrain catecholaminergic sites, that is, in the ventral telencephalon (a/a1), in the preoptic area (b/b1-d/d1), or in the alar ventral thalamus (interpreted as zona incerta cells in the prethalamus, d/d1; Rink & Wullimann, 2002a). Open green arrows point to TH-positive cells, white arrow to gigantocellular preoptic neuron. Scale bars = 250 µm. Abbreviations: A, anterior thalamic nucleus; Dd/Dl/Dm/Dp, dorsal/lateral/medial/posterior zone of dorsal telencephalon; ENv, ventral entopeduncular nucleus; Ha, habenula; lot, lateral olfactory tract; ot, optic tract; PM, magnocellular preoptic nucleus; PPa/PPp, anterior/posterior parvocellular preoptic nucleus; SC, suprachiasmatic nucleus; TeO, optic tectum; Vd/Vi/Vp/Vv, dorsal/intermediate/posterior/ventral nucleus of ventral telencephalon; VL, ventrolateral thalamic nucleus