Table 1. Markers used in CEC assays.

Marker	Description	Subtype association	Expression level	Coexpression	References
CD31	PECAM-1	Pan-endothelial	++a	P, Pan-leukocyte	(Beerepoot et al, 2004)
CD34	Stem cell marker	Pan-endothelial	++a	S	(Furstenberger et al, 2006)
CD36	Collagen receptor I	Micro vascular	+a	P, E, M, D	(Moroni et al, 2005)
CD54	ICAM-1	Inflammation	+a	L, M	(Dixon et al, 2004)
CD62-E	E-selectin	Inflammation	++	—	(Dixon et al, 2004)
CD62-P	P-selectin	Inflammation	+	P	(Corcoran et al, 2006)
CD105	Endoglin	Angiogenesis, malignant	++a	S, Mb	(Rowand et al, 2007)
CD106	VCAM-1	Inflammation, malignant	+a	—	(Dixon et al, 2004)
CD137	ILA/4	Malignant	+	Lb, D	(Seaman et al, 2007)
CD144	VE-cadherin	Pan-endothelial	+a	—	(Smirnov et al, 2006)
CD146	MelCAM	Pan-endothelial	++a	Lb	(Dignat-George et al, 2007)
CD202b	Tie-2	Angiogenesis	(+)a	—	(Smirnov et al, 2006)
CD276	B7-H3	Malignant	+	D, Mb	(Seaman et al, 2007)
CD309	VEGFR-2	Angiogenesis	(+)a	S	(Beerepoot et al, 2004)
VWF		Pan-endothelial	++a	P	(Woywodt et al, 2006)
UEA-1		Pan-endothelial	++	—	(Woywodt et al, 2006)
DiL-AcLDL		Pan-endothelial	++	—	(Voyta et al, 1984)

PECAM-1=platelet/endothelial cell adhesion molecule 1, ICAM-1=intracellular adhesion molecule 1, VCAM-1=vascular cellular adhesion molecule 1, ILA/4=inducible by lymphocyte activation /4, MelCAM=melanoma-associated cellular adhesion molecule, Tie-2=angiopoietin-1, 2, 4 receptor, B7-H3=B7 homologue 3, VEGFR-2=vascular endothelial growth factor receptor 2. S=hematopoietic stem cells, L=lymphocytes, P=platelets, M=monocytes, E=erythrocytes, D=dendritic cells.

Expression levels: ++=strong, +=moderate, (+)=weak.

^aIndicates data based on flow cytometric results from the authors.

^bIndicates presence on activated cells.