Table 1. Fibroblast markers in healthy heart and following pressure overload.

The table includes indications regarding the specificity of the markers and references in which they were tested. Markers have been arbitrarily ranked beginning with the overall most robust fibroblast marker, PDGFRα.

	Fibroblasts labelled		Other cell types labelled
	Healthy adult heart	Hypertensive disease	Healthy adult heart	Hypertensive disease
PDGFRα	All (7,28)	All (7,28)	Epicardium (28)	Epicardium (28)
Collagen 1a1-GFP	All (7,28)	All (7,28)	Epicardium, large vessels (28)	Epicardium, large vessels (28)
Tcf21	All/most (8)	A subset in interstitial and fibrotic lesions	Epicardium (8,42)	Epicardium (42)
DDR2	All (18)	All (18)	Epicardium (71)	Epicardium (72)
Thy1	Most/all (28, 54)	Most/all (28, 54)	Endothelium, immune cells	Endothelium, immune cells
αSMA	No expression	A subset in interstitial lesions (28)	Smooth muscle (38), pericytes	Smooth muscle, pericytes, endothelium (9)
Vimentin	All	All	Multiple cell types including endothelium (22)	Multiple cell types
Wt1	-	A subset in interstitial lesions (42)	Epicardium (42, 73)	Epicardium (42)
Tbx18	-	A subset in interstitial lesions (42)	Epicardium (42)	Epicardium (42)
Periostin (secreted)	-	Associated with areas of interstitial and perivascular fibrosis (39, 74)	Valves (75)	-
FSP1	Rare (9)	A subset in perivascular lesions (28)	Immune cells (28, 27, 9)	Immune cells (28, 27, 9), endothelial cells (9)