Table 3.

Summary of mouse TG cell types and previously reported properties in rats

					Capsaicin Sensitivity			Previously Reported Properties
Type	Cell Size	Rm	Em	IB4	C57BL/6	BALB/c	Rats	CGRP	SP	Innervation
1	S	High	High	±	±	±	±	+	−	NR
2	S/M	High	High	+	±	−*	+†	−	−	H-skin
4	M	Low	Low	−	−	−	−	−	−	H-skin
9	M	Low	High	−	±	±	+†	+	±	H-skin
13	M	Low	High	+	±	−*	+†	NR	NR	G-skin

For cell size, 11- to 22-μm and 23- to 34-μm cell diameter represent small (S) and medium (M), respectively. Findings for capsaicin sensitivity are relative to previous studies for rat TG neurons (Xu et al. 2010; Ono et al. 2010). The remaining properties are from previous studies on rat dorsal root ganglion (DRG) neurons (Petruska et al. 2000a,b, 2002; Rau et al. 2005, 2006, 2007, 2014; Jiang et al. 2006, 2013; Jiang and Cooper 2011).

IB₄, isolectin B₄; CGRP, calcitonin gene-related polypeptide; SP, substance P.

“+” And “−” indicate the presence and absence, respectively. NR indicates no report. H-skin and G-skin indicate hairy and glabrous skins, respectively. Note that there is a difference in capsaicin sensitivity in type 1 between Wister TG(±) and Sprague-Dawley DRG(+).

^*Difference for C57BL/6.

^†Difference for both mouse strains.