Table 1.

Summary of all publications utilizing optogenetics for interrogation of spinal cord somatosensory circuitry.

		Optical stimulation method
		In vitro	Peripheral	Central stimulation of spinal cord	Central stimulation of descending pathways
Method of opsin expression in tissue	Transgenic	Wang and Zylka (2009) Foster et al. (2015) Honsek et al. (2015) Hachisuka et al. (2016) Bellardita et al. (2017) Uhelski et al. (2017) Pagani et al. (2019) Smith-Edwards et al. (2019) Hachisuka et al. (2020)	Ji et al. (2012) Daou et al. (2013) Bonin and De Koninck (2014) Draxler et al. (2014) Bonin et al. (2016) Christensen et al. (2016) Daou et al. (2016) Stemkowski et al. (2016) Beaudry et al. (2017) Ghitani et al. (2017) Samineni et al. (2017a) Sun et al. (2017) DeBerry et al. (2018) Tashima et al. (2018)	Bonin and De Koninck (2014) Montgomery et al. (2015) Park et al. (2015) Bonin et al. (2016) Bellardita et al. (2017) Lu et al. (2017) Samineni et al. (2017b) Chen et al. (2018) Pagani et al. (2019) Petitjean et al. (2019)	Chen et al. (2018)
	Viral vector	Boada et al. (2014) Yang et al. (2015) Christensen et al. (2016) Hachisuka et al. (2016)	Boada et al. (2014) Iyer et al. (2014) Li et al. (2015) Barik et al. (2018) Mayer et al. (2019)	Iyer et al. (2014) Montgomery et al. (2015) Bonin et al. (2016) Christensen et al. (2016) Nam et al. (2016) François et al. (2017) Mu et al. (2017) Chen et al. (2018) Mondello et al. (2018) Wang et al. (2018)	François et al. (2017) Gao et al. (2019) Huang et al. (2019)

This table combines all examples of optogenetic interrogation in the dorsal horn on the spinal cord, grouped by the site of stimulation and by the method of opsin delivery.