Table 1.

Sample characteristics of leukemia vs. normal stem cells.

	LSC	HSC
Frequency	Usually rare	Rare
Cell cycle status	Quiescent	Quiescent
MDR-1 expression	+	+
CD34 expression	+	+
CD38 expression	Sometimes	-
HLA-DR expression	-	-
CD71 expression	-	-
CD33 expression	-(Usually)	-
CD117 expression	-	+
CD90 expression	-	+
CD123 expression	+	-(Usually)
Aldehyde dehydrogenase expression	+ But intermediate	+ (Bright)

LSC, leukemia stem cell; HSC, hematopoietic stem cell; MDR, multi-drug resistance.