TABLE 2.

Incorporation of radiolabeled precursors

Compound	Concn (μg/ml)	Precursora
		[3H]thymidine		[3H]uridine		3H-labeled amino acids
		% Uptakeb	% Incorpc	% Uptake	% Incorp	% Uptake	% Incorp
3	128	2	6	2	4	11	41
	16	64	60	77	67	50	72
4	128	1	12	3	19	11	42
	16	50	43	52	48	60	45
5	128	2	2	8	1	27	28
	16	1	2	2	1	19	11
6	128	6	8	8	6	16	2
	16	84	52	66	26	48	2
Ciprofloxacin	0.25	60	4	103	90	105	96
Rifampin	0.25	159	113	46	2	85	22
Chloramphenicol	8	112	85	109	100	50	27

^aAfter 10 min of drug treatment and 5 min of pulse labeling. Results are presented as a percentage of untreated-control results. 

^bTotal radiolabeled precursor remaining in the cells after an instant saline wash. 

^cPrecursor incorporated into TCA-precipitable material. Incorp, incorporation.