Overview: The normal course of most biologically catalyzed processes is tightly regulated at the genetic and physiological levels. The regulatory mechanisms are diverse, sometimes redundant, and it is becoming increasingly apparent that, at the genetic level, the range of mechanisms may be limited only by the permutations and combina tions available. For each microbial cell, evolution appears to have resulted in maximized advantage to that cell, achieving regulatory balance. Genetic engineering encompasses our attempts to perturb the genetic regulation of a cell so that we may obtain desired
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