Neuropeptide
= Neuropeptide
A <neuropeptide> is a <peptide> used for signaling by <neurons>. A <neuropeptide> can act through a <receptor> to alter the excitability or responsiveness of a target, often contributing to <neuromodulation>.
One <neuron> can release a <neuropeptide> together with another <neurotransmitter>, an example of <co-transmission>. Identifying the <cell> by one signal therefore does not mean an experimental manipulation changes only that <molecule>'s action.