TABLE 2.

Quantitation of tetrapeptide in DTZ-treated cells relative to the control^a

Expt	% Increase in tetrapeptide after DTZ exposure for:
	3 h	8 h
1	NDb	29
2	4	37
Avg		33 ± 4

^aExtracts were prepared from E. coli MG1655 with or without DTZ (50 μM) treatment as described in the text. Tetrapeptide was quantitated by HPLC-MS. The amount of tetrapeptide in control samples is defined as 100%; the increase in tetrapeptide relative to the control sample is shown. In experiment 1, cells were taken directly from the wells of a Bioscreen plate; in experiment 2, cells were grown in a flask.

^bND, not determined.