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9% and 51.9%, respectively. When the results with pretreatment were taken into account, R428 purchase the outcomes of Bruker MS improved to correct species identification of 50.6% and correct genus identification of 60.8% of the isolates. The number of strains that could not be identified because of absence in the database was significantly larger for the Bruker system as compared with the Shimadzu system (19.0% vs. 7.6%, p?0.035). With the Bruker system duplicate measurements yielded uniform results. Results of Shimadzu MS were not uniform for two isolates (2.5%), both concerning Bacteroides uniformis. The first was manually identified as B.?uniformis and B.?fragilis, the second as B.?uniformis, B.?fragilis and Bacteroides sp. The overall results are representative of the results for the various genera, except for the Bacteroides fragilis group and Gram-positive anaerobic cocci (GPAC). The Bruker system showed a significantly higher percentage of correct species identification of members of the Bacteroides fragilis group than the Shimadzu system; 87% (13 out of 15, no difference between pretreated and direct measurement) and 53% (8 out of 15, p?0.046), respectively. On the other hand, JQ1 order the Shimadzu system performed significantly better for the identification of GPAC (p?E-64 by the Bruker system were: Anaerococcus hydrogenalis instead of A.?vaginalis (n?=?2, only with pretreatment), Bacteroides vulgatus instead of B.?dorei (n?=?2, not in the database) and Clostridium hathewayi instead of C.?clostridioforme (n?=?1). Log scores of these five strains were not significantly different from the log scores of 10 strains that were correctly identified to these particular species (data not shown). The one minor error by Shimadzu was: Peptostreptococcus anaerobius instead of P.?stomatis (n?=?1, not in the database).