May be divided according to the proper temperature, growth is a group which has a good temperature, mesophilic flourish 30 C Streptococcus Lactococcus Leuconostoc and underweight, including S. lactis lactis lactis and ssp ssp. cremoris and thermophilic group., which flourish well at a temperature of 40-45 C include Lactobacillus helveticus, Lb and Lb. bulgaricus. lactis, including S. thermophilus, etc.
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