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Combinatorial expression of signaling molecules in neurons upstream of CRHNs. (A and B) Graphs show the number (A) and percentage (B) of upstream neurons expressing different numbers of neurotransmitters and/or neuromodulators. (C and D) Graphs show the number of cells that coexpressed different neuropeptides with the excitatory neurotransmitter glutamate or the inhibitory neurotransmitter GABA or glycine or acetylcholine (C) or with different neuromodulatory biogenic amines (D).
