Fig. 3

Expression of TH by fully differentiated sympathetic neurons in zebrafish. a Dorsal view of a wild-type embryo probed at 48 hpf by in situ hybridization with TH. At this developmental stage, TH mRNA is expressed by dopaminergic neurons of the ventral diencephalon (hatched box), arch-associated catecholaminergic neurons (arrowhead) and neurons constituting the locus coeruleus (arrow). b Higher magnification of dopaminergic neurons stained with the TH probe