following injections of wheat germ agglutinin-conjugated horseradish peroxidase ( wga-hrp ) or the fluorescent tracer fluoro-gold into the magnocellular preoptic area and the horizontal limb of the diagonal band , retrogradely labelled neurons were found in the homotopic region of the contralateral basal forebrain .
C0019941
horseradish peroxidase
C0078473
wga-hrp