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[2]
Systemic morphine suppresses noxious stimulus-evoked Fos protein-like immunoreactivity in the rat spinal cord .2 Presley RW,Menetrey D,Levine JD,et al. J Neurosci . 1990
[3]
Projection neurons in lamina i of rat spinal cord with the neurokinin 1 receptor are selectively innervated by substance P-containing afferents and respond to noxious stimulation .2 Todd AJ,Puskar Z,Spike RC,Hughes C,Watt C,Forrest L. J Neurosci . 2002