Fourteen microorganisms, oral isolates from man or marmoset, were examined for calcification in a synthetic medium. The medium was essentially identical to that in which Bacterionema matruchotii acquires intracellular apatite. Four of the microorganisms, Escherichia coli, Alcaligenes marshalli, Aerobacter cloacae, and Proteus mirabilis, developed intracellular calcifications.
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