The relationship between neurokinin-1 receptor and substance P in the medullary dorsal horn: A light and electron microscopic immunohistochemical study in the rat
J. Li, D. Wang, T. Kaneko, R. Shigemoto, S. Nomura, N. Mizuno, Neuroscience Research 36 (2000) 327–334.

Substance P receptor (NK1)-immunoreactive neurons projecting to the periaqueductal gray: Distribution in the spinal trigeminal nucleus and the spinal cord of the rat
J. Li, Y. Ding, K. Xiong, J. Li, R. Shigemoto, N. Mizuno, Neuroscience Research 30 (1998) 219–225.

Trigeminoparabrachial projection neurons showing substance P receptor-like immunoreactivity in the rat
Y. Ding, M. Takada, R. Shigemoto, N. Mizuno, Neuroscience Research 23 (1995) 415–418.