Table 1. Number of species matching each primer in a filtered RDP dataset.

Taxon	Total species	Left	Righta
Escherichia	322	320	318
Citrobacter	113	111	110
Bacteroides	275	265	270
Streptococcus	1249	1243	1244
Staphylococcus	704	696	694
Lactobacillus	1922	1908	1910
Lachnospiraceae	82	82	82
Peptostreptococcus	28	28	28
Anaerococcus	29	29	29
Megasphaera	38	38	38
Dialister	21	21	21
Candidatus	579	377	566
Mobiluncus	25	25	25
Propionibacteriaceae	12	12	12
Bifidobacterium	146	145	143
Porphyromonas	111	109	111
Prevotella	269	264	264
Fusobacterium	103	102	103
Sneathia	4	4	0(4)b
Leptotrichia	60	60	1(58)b
Gardnerella	3	3	3
Ureaplasma	36	0(34)c	36
Mycoplasma	414	95(331)d	336

^anumber of hits with identity at the 3′ 5 nucleotides and up to 2 mismatches in the rest of the primer:

^bnumber of hits requiring identity at the 3′ 4 nucleotides:

^cnumber of hits allowing 3 mismatches and identity at the 3′ 5 nucleotides:

^dnumber of hits allowing 4 mismatches and identity at the 3′ 5 nucleotides.