following injection of the retrograde tracer , wheatgerm agglutinin conjugated to horseradish peroxidase ( wga : hrp ) , into the ventroposterior medial thalamus ( vpm ) , the number of neuronal profiles that were double-labeled with wga : hrp and glu-li was greatest in principal sensory nucleus ( pr5 ) , followed by subnuclei interpolaris ( sp5i ) and caudalis ( sp5c ) .
C0019941
horseradish peroxidase
C0078473
wga : hrp