Substance P receptor (i.e.NK1 ) - like immunoreactive (SPR- L I) neurons were observed in the newborn and adult humanspinal cord.Substance P receptor- like im munoreactive neuronal cell bodies were seen mostfrequently in lamina I,and were scat-tered throu Substance P receptor (i.e.NK1) - like immunoreactive (SPR-L1 I) neurons were observed in the newborn and adult humans cordinal cord. Substance P receptor-like im munoreactive neuronal cell bodies were seen most frequently in lamina I, and were scat-tered throu