Table 1.

Copy number of RecQ helicases in resting B cells, EBV-transformed LCL cells and telomerase-positive immortal LCL cells.

Cells	WRN	BLM	RTS	RECQL1	RECQL5
Resting B cells (N0008R)	1,200	330	120	2,100	340
Pre-immortal LCL cells (N0008T)	94,000	27,000	1,100	15,000	330
Post-immortal LCL cells (N68031M)	200,000	33,000	1,000	21,000	330

The copy number of each RecQ helicase was determined by quantitative immunoblotting versus standard recombinant RecQ helicases. Each numeral represents a mean of duplicated samples. Reprinted from the paper by Kawabe et al. (2000).