Mackenzie E, Standen N B
Cell Tissue Res. 1976 Oct 1;173(1):129-32. doi: 10.1007/BF00219270.
The development of noradrenergic innervation was studied in the mouse heart using fluorescence histochemistry. Following incubation of hearts with alpha-methylnoradrenaline fluorescent nerve fibres were seen as early as 13 days in utero. It is suggested that the neuronal uptake mechanism for noradrenaline is functional at an early stage.