E, cum nu gasesti?
https://www.britannica.com/science/Streptococcus#ref895712
Among the lactic species, S. lactis and S. cremoris are used in commercial starters for the production of butter, cultured buttermilk, and certain cheeses
https://en.wikipedia.org/wiki/Lactococcus_lactis
https://microbewiki.kenyon.edu/index.php/Lactococcus_lactis