Summary of mutation sites of the ltsA mutant strains. The length of the horizontal lines corresponds to that of the LtsA proteins produced by the ltsA mutants. Double-headed arrow indicates probable glutamine amido transfer (GAT) domain of the LtsA protein. tr: temperature-resistant, ts: temperature-sensitive, r: resistant to lysozyme, s: sensitive to lysozyme.*These two strains probably carry suppressor mutations that suppress the temperature-sensitive growth of ltsA mutants as described in the text. #The ltsA::kan disruptant strain carries the 5'-truncated ltsA and the 3'-truncated ltsA. However, a product expressed from only the 3'-truncated one is shown because the 5'-truncated gene is not transcribed due to the absence of its promoter.