Lactobacillus fermentum B-54, Lactobacillus rhamnosus GR-1, Lactobacillus rhamnosus GG and Lactobacillus acidophilus. Some experts suggest that miso is a source of "Lactobacillus acidophilus". Yakult ingredients are water, skimmed milk, glucose-fructose syrup, sucrose, and live "Lactobacillus casei Shirota" bacteria. The vaginal microflora consist mostly of various lactobacillus species. Most strains used as probiotics belong to the genus "Lactobacillus". By definition, lactic acid bacteria ("Lactobacillus", "Bifidobacterium") do not form spores. Dextran is now produced from sucrose by certain lactic acid bacteria of the family lactobacillus. It acquires its characteristic sourness through inoculation with lactobacillus bacteria. Sourdough is a dough containing a "Lactobacillus" culture in symbiotic combination with yeasts. Some beers use other microbes in addition to yeasts, such as "Lactobacillus" or "Brettanomyces". In addition, other organisms such as "Lactobacillus" bacteria produce acids which contribute to the sourness. Lactobacillus fermentum belongs to the genus "Lactobacillus". Broad-spectrum antibiotics kill healthy bacteria in the vagina, such as "Lactobacillus". Lactobacillus sakei is a bacterium species in the genus "Lactobacillus". The milk-souring bacterial genus "Lactobacillus" is used to make yogurt and cheese.