the afferent connections of the substantia innominata ( si ) in the rat were determined employing the anterograde axonal transport of phaseolus vulgaris leucoagglutinin ( pha-l ) and the retrograde transport of wheat germ agglutinin conjugated to horseradish peroxidase ( wga-hrp ) , in combination with histochemical procedures to characterize the neuropil of the si and identify cholinergic cells .
C0019941
horseradish peroxidase
C0078473
wga-hrp