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A checkerboard membrane showing hybridization of clinical samples with oligonucleotide probes. Probes for cultivated species (black) and as yet uncultivated species (green) are listed across the top. Each horizontal lane represents the total nucleic acids (TNA) from a sample from the indicated numbered tooth. Standards comprised a mixture of ‘complementary’ sequences from all the test taxa at 0.004 and 0.04 pM, respectively. Teeth marked with an asterisk (*) were absent.
