we have studied the distribution of gamma-aminobutyric acid ( gaba ) neurons , axons , and synapses in the rat and monkey hippocampal formation by using glutamate decarboxylase ( gad ) immunocytochemistry together with nissl stains , electron microscopy , and double-labeled retrograde transport of horseradish peroxidase .
C0027882
neurons
C0004461
axons