<P> Bile Esculin Agar (BEA) is a selective differential agar used to isolate and identify members of the genus Enterococcus, formerly part of the "group D streptococci" (enterococci were reclassified in their own genus in 1984). </P> <P> Bile salts are the selective ingredient, while esculin is the differential component . Enterococcus hydrolyze esculin to products that react with ferric citrate in the medium to produce insoluble iron salts, resulting in the blackening of the medium . </P>

What is the source of bile in bile esculin agar