following injections of retrograde tracers within the forebrain or cerebellum in mice exposed in utero to the radiolabeled nucleoside on embryonic days 9-11 ( e9-11 ) , combined histochemical and autoradiographic preparations revealed : 1 ) locus coeruleus neurons that give rise to long distance axonal projections to the cortices are born exclusively on e9 ( other studies indicate that these cells are noradrenergic ) ;
C0027882
neurons
C0004461
axonal