reported to be essential [Pubmed|12682299], however deletion mutants have been reported by Ferrari et al. (1985) and Xia et al (2007) [Pubmed|17602222]

auxotrophy for D-alanine

reported to be essential [Pubmed|12682299], however deletion mutants have been reported by Ferrari et al. (1985) and Xia et al (2007) [Pubmed|17602222]

auxotrophy for D-alanine

a [[gene|ytnA]] [[gene|alr]] double mutant is not viable due to the inability to acquire D-alanine [https://www.biorxiv.org/content/10.1101/562850v2 reference]