please make the given paragraph more coherent:
The retainment of viability despite a dam gene knockout is also seen in Salmonella and Aggregatibacter actinomycetemcomitans. In organisms like Vibrio cholerae and Yersinia pseudotuberculosis, the dam gene is essential for viability.
The retainment of viability despite a dam gene knockout is also seen in Salmonella and Aggregatibacter actinomycetemcomitans. However in organisms like Vibrio cholerae and Yersinia pseudotuberculosis, the dam gene is essential for viability.