ABSTRACTWhen 10 Escherichia coli mutant strains with defects in lipopolysaccharide (LPS) core biosynthesis were grown on agar medium at 30°C, four of them, the ⌬waaF, ⌬waaG, ⌬waaP, and ⌬waaB strains, formed mucoid colonies, while the other six, the ⌬waaU, ⌬waaR, ⌬waaO, ⌬waaC, ⌬waaQ, and ⌬waaY strains, did not. Using light microscopy with tannin mordant staining, the presence of exopolysaccharide around the cells of the mutants that formed mucoid colonies could be discerned. The ⌬waaF mutant produced the large…
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