SUMMARY: The isoprenoid quinone contents of streptococci of serological groups D and N were investigated. subsp. and subsp. strains contained demethylmenaquinones with nine isoprene units as their major isoprenologues. Menaquinones with eight isoprene units predominated in subsp. and S. subsp. whereas menaquinones with nine isoprene units constituted the major components in strains of subsp. and subsp. Strains of and contained neither menaquinones nor ubiquinones. The isoprenoid quinone data correlate well with other kinds of data on these organisms and are of value in the classification of these bacteria.


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