Table 5

Substrate efficiency of dTMP, d4TMP, or AZTMP for 5′ (3′)-deoxyribonucleotidase

Substrate	K_m	V_max	Substrate Efficiency
	mM	units^5-a/mg	V_max/K_m
dTMP	1.25	347	277
AZTMP	0.41	187	456
d4TMP	1.47	33	22