more recent studies have shown that fibers and cell bodies of the dentate gyrus are immunoreactive for variety of neuroactive substances including the excitatory amino acids glutamate and aspartate , the inhibitory transmitter gaba , as well as peptides of many types including the opioid peptides , enkephalin and dynorphin , several forms of somatostatin , neuropeptide y , cholycystokinin , vasoactive intestinal peptide and substance p .
C0205753
opioid peptides
C0013355
dynorphin