The cellulose-digesting bacteria are of the aciduric group, akin to the Lactobacillus acidophilus of Bulgarian buttermilk, which (some scientists think) helps un usual numbers of .
Breaker of the convention was a milk company, Borden's advertising Walker-Gordon acidophilus milk.
It is a culture of Lactobacilli (bulgaricus, acidophilus, moro) and yeast (fragitans), grown in heavy cream and buttermilk, which continue to work in hydrogenated vegetable oils.