Assertion: sympathetic nervous system's effect | /r/CapableOf | superimpose on each other
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text: It gets even more complex when the release of co-transmitters, which is dependent on the firing rate of sympathetic nerve fibers , and neuroanatomical facts are taken into account, because all known co-transmitters like NPY, ATP, and nitric oxide are potent immune modulators and, thus, effects superimpose on each other.