TABLE 1.

Measurements of NADH-Q₁ and NADH-K₃Fe(CN)₆ oxidoreductase activities in mitochondrial membranes isolated from LL/2 and 3A20-4 cells^a

Cell line	Avg activity (nmol/min/mg, ± 2 SEM)b		NADH-Q1/NADH-K3Fe(CN)6 (103)c
	NADH-Q1 oxidoreductase	NADH-K3Fe(CN)6 oxidoreductase
LL/2	11.0 (±1.2)	2,079 (±245)	5.3
3A20-4	<0.15	1,693 (±150)	<0.089 (<1.7)

^aThe values for NADH-Q₁ represents the total activity, with >98% being rotenone sensitive. 

^bDeterminations were made in triplicate. 

^cValue in parentheses represents the percentage of normalized NADH-Q₁ oxidoreductase activity in 3A20-4 relative to that in LL/2.