TABLE 3.

Substrate specificities of 4NBZDH activities^a

Substrate	Value for source of cell extract
	TW3 grown on 4-nitrotoluene	TW3 grown on toluene	E. coli BL21(DE3) expressing ntnC
4-Nitrobenzaldehyde	100	100	100
3-Nitrobenzaldehyde	121	126	120
4-Methylbenzaldehyde	28	27	25
3-Methylbenzaldehyde	22	22	20
Benzaldehyde	40	43	37

^aActivities are expressed as percentages relative to that observed with 4-nitrobenzaldehyde, each value being the mean from two different cultures. No individual value was more than ±3% from the mean.