References:

• Defective cell wall synthesis in Streptococcus pneumoniae R6 depleted for the essential PcsB putative murein hydrolase or the VicR (YycF) response regulator.

  Ng WL, Kazmierczak KM, Winkler ME.
  Mol Microbiol. 2004 Aug; 53(4):1161-75.

• Structural diversity and biological significance of lipoteichoic acid in Gram-positive bacteria: focusing on beneficial probiotic lactic acid bacteria.

  Shiraishi T, Yokota S, Fukiya S, Yokota A.
  Biosci Microbiota Food Health. 2016;35(4):147-161. doi: 10.12938/bmfh.2016-006. Epub 2016 Jun 9.

• Genome of the bacterium Streptococcus pneumoniae strain R6.

  Hoskins J, Alborn WE Jr, Arnold J, Blaszczak LC, Burgett S, DeHoff BS, Estrem ST, Fritz L, Fu DJ, Fuller W, Geringer C, Gilmour R, Glass JS, Khoja H, Kraft AR, Lagace RE, LeBlanc DJ, Lee LN, Lefkowitz EJ, Lu J, Matsushima P, McAhren SM, McHenney M, McLeaster K, Mundy CW, Nicas TI, Norris FH, O'Gara M, Peery RB, Robertson GT, Rockey P, Sun PM, Winkler ME, Yang Y, Young-Bellido M, Zhao G, Zook CA, Baltz RH, Jaskunas SR, Rosteck PR Jr, Skatrud PL, Glass JI.
  J Bacteriol. 2001 Oct; 183(19):5709-17.

• The crystal structure of alanine racemase from Streptococcus pneumoniae, a target for structure-based drug design.

  Im H, Sharpe ML, Strych U, Davlieva M, Krause KL.
  BMC Microbiol. 2011 May 25;11:116. doi: 10.1186/1471-2180-11-116.