in the anteroventral cochlear nucleus , the inhibitory amino acid transmitters , gamma aminobutyric acid ( gaba ) , and glycine , as well as the presumed excitatory amino acid transmitter of the auditory nerve , have been directly or indirectly localized , immunocytochemically , to discrete populations of terminals on spherical cells with distinct morphologic characteristics .
C0002520
amino acid
C0243046
excitatory amino acid