FIG. 6.

Ammonia released after incubation of biuret with cell extracts from E. coli DH5α (atzE) and E. coli DH5α (atzF). Symbols: □, 3 mM biuret plus crude cell extracts from E. coli DH5α (atzE) and E. coli DH5α (atzF); ▿, 3 mM biuret plus cell extract from E. coli DH5α (atzE); ▾, 3 mM urea plus cell extract from E. coli DH5α (atzF); ○, 3 mM biuret plus cell extract from E. coli DH5α (atzF); ●, 3 mM biuret plus cell extract from E. coli DH5α(pUC18). Values are the means of results from three replicates. Error bars indicate standard deviations of the means.