Table 1. Connexin expression in different organs.

(Cx, connexin).

Organ	Cell type	Cx species	Reference
Brain	Astrocytes	Cx30, Cx43	(Dermietzel et al., 1991, Nagy and Rash, 2000)
	Microglial cells	Cx26, Cx32	(Eugenín et al., 2001, Parenti et al., 2002, Garg et al., 2005, Takeuchi et al., 2006, Kielian, 2008)
	Oligodendrocytes	Cx32, Cx47, Cx29	(Dermietzel et al., 1989, Altevogt et al., 2002, Odermatt et al., 2003)
	Neurons	Cx36, Cx45	(Takeuchi and Suzumura, 2014)
	Blood-brain barrier endothelial cells	Cx37, Cx40, Cx43	(Little et al., 1995, Traub et al., 1998, Nagasawa et al., 2006, De Bock et al., 2014)
	Blood-brain barrier pericytes	Cx37, Cx40, Cx43	(Little et al., 1995, Traub et al., 1998, Nagasawa et al., 2006, De Bock et al., 2014)
Heart	Smooth muscle cells	Cx40, Cx43, Cx45	(Gros and Jongsma, 1996, Severs et al., 2004)
	Cardiomyocytes	Cx40, Cx43, Cx45	(Gros and Jongsma, 1996, Severs et al., 2004)
Blood vessels	Endothelial cells	Cx43, Cx37, Cx40	(Chadjichristos et al., 2010, Scheckenbach et al., 2011)
	Smooth muscle cells	Cx43, Cx45, Cx40, Cx37	(Chadjichristos et al., 2010, Scheckenbach et al., 2011)
Liver	Sinusoidal endothelial cells	Cx26, Cx43	(Hernández-Guerra et al., 2014)
	Hepatic arteries and portal vein endothelial cells	Cx37, Cx40	(Fischer et al., 2005, Shiojiri et al., 2006)
	Hepatocytes	Cx26, Cx32	(Kyoi et al., 1992, Ohkusa et al., 1995, Iwata et al., 1998, Radebold et al., 2001)
	Kupffer cells	Cx26, Cx43	(González et al., 2002, Eugenín et al., 2007)
	Stellate cells	Cx26, Cx43	(Fischer et al., 2005, Maes et al., 2015b)
Stomach and intestines	Stomach	Cx26, Cx32, Cx40, Cx43, Cx45	(Wang and Daniel, 2001, Cousins et al., 2003, Liu et al., 2010, Wang et al., 2014)
	Foveolar cell	Cx32	(Fink et al., 2006)
	Small intestine	Cx26, Cx31, Cx57	(Filippov et al., 2003)
	Musculus externa cell	Cx40, Cx43	(Wang and Daniel, 2001, Liu et al., 2008)
	Myenteric plexus cell	Cx36, Cx40, Cx43, Cx45	(Wang and Daniel, 2001, Liu et al., 2008, Frinchi et al., 2013)
	Epithelial cell	Cx32, Cx37, Cx43	(Traoré et al., 2003, Husøy et al., 2004, Hakim et al., 2008)
	Interstitial cell of cajal	Cx43	(Seki and Komuro, 2002)
	Colon	Cx31, Cx31.9, Cx43	(Ismail et al., 2014, Li et al., 2015b)
	Musculus externa cell	Cx26, Cx40, Cx43	(Wang and Daniel, 2001, Mattii et al., 2013)
	Myenteric plexus cell	Cx36, Cx40, Cx43, Cx45	(Wang and Daniel, 2001, Frinchi et al., 2013, McClain et al., 2014)
	Epithelial cell	Cx26, Cx32, Cx37, Cx43	(Kanczuga-Koda et al., 2004, Kanady et al., 2015)
	Muscularis mucosa cell	Cx43	(Ismail et al., 2014)
	Interstitial cell of Cajal	Cx43	(Nemeth et al., 2000)
Skin	Keratinocytes	Cx26, Cx30.3, Cx30, Cx31.1, Cx31, Cx40, Cx43, Cx45	(Di et al., 2001, Brandner et al., 2004, Wang et al., 2007, Churko and Laird, 2013, Martin et al., 2014)
	Fibroblasts	Cx43, Cx45, Cx40	(Wright et al., 2009, Meyer et al., 2014, Cogliati et al., 2015, Tarzemany et al., 2015)
	Melanocytes	Cx43	(Haass et al., 2004, Rezze et al., 2011, Penuela et al., 2012)
Kidney	Smooth muscle cells	Cx37, Cx45	(Arensbak et al., 2001, Hanner et al., 2010, Li et al., 2015a)
	Podocytes	Cx43, Cx45	(Hanner et al., 2010, Morioka et al., 2013, Yang et al., 2014)
	Pericytes	Cx37	(Zhang et al., 2006, Hanner et al., 2010)
	Mesangial cells	Cx40, Cx45	(Arensbak et al., 2001, Kurtz et al., 2007, Hanner et al., 2010, Morioka et al., 2013)
Lung	Alveolar epithelium	Cx26, Cx32, Cx43, Cx46	(Koval, 2002)
Eye	Lens epithelial cells	Cx43, Cx50	(Berthoud et al., 2014)
Immune cells	T-cells	Cx40, Cx43	(Oviedo-Orta et al., 2000)
	B-cells	Cx40, Cx43	(Oviedo-Orta et al., 2000)
	Monocytes	Cx43	(Navab et al., 1991)
	Macrophages	Cx37, Cx43	(Beyer and Steinberg, 1991, Alves et al., 1996, Kwak et al., 2002)
Pancreas	β-cells	Cx36, Cx43, Cx45	(Charollais et al., 1999)
	Exocrine pancreas	Cx32	(Frossard et al., 2003)
Skeletal muscle	Myoblasts	Cx39, Cx40, Cx43, Cx45	(Merrifield and Laird, 2015)
Bone	Osteocytes	Cx37, Cx43	(Krüger et al., 2000, Paic et al., 2009, Pacheco-Costa et al., 2014)
	Osteoblasts	Cx37, Cx43, Cx45, Cx46	(Civitelli et al., 1993, Donahue et al., 1995, Krüger et al., 2000, Chaible et al., 2011, Plotkin and Bellido, 2013)
	Osteoclasts	Cx37, Cx43	(Paic et al., 2009, Pacheco-Costa et al., 2014)
	Chondrocytes	Cx32, Cx43, Cx45, Cx46	(Mayan et al., 2013)