TABLE 2.

Peak acid formation enzyme levels

Enzyme	Peak sp act (U/mg)a in:
	Strain 824(pIMP1) (control)	Strain 824(pRD4)	Strain 824(pRD1)
PTB	8.8 ± 0.5	4.7 ± 0.6	2.6 ± 0.6b
BK	2.0 ± 0.6	0.31 ± 0.03	0.3 ± 0.1
PTA	1.6 ± 0.45	0.76 ± 0.06	1.1 ± 0.8
AK	3.1 ± 1.3	0.26 ± 0.01	2.1 ± 1.3
LDH	1.3 ± 0.06	NDc	4.1 ± 1.5

^aMean ± standard error of the mean (n = 2) unless otherwise indicated. 

^bMean ± standard error of the mean (n = 3). 

^cND, not determined.