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Summary: Upon the basis of cell-wall composition the oral bacteria Leptotrichia dentium and L. buccalis appear to form a natural generic group related to Nocardia and possibly Lactobacillus. An aerobic oral actinomycete of the type commonly called Nocardia has been shown to resemble closely the anaerobic pathogenic Actinomyces which parasitizes man. The cell-wall composition of Streptomyces, Nocardia, Lactobacillus and Fusobacterium strains is also reported.
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Davis et al. (1959) studied this question.
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