Table 1. Details of the specific horse-radish peroxidase (HRP) labeled oligonucleotide probes used in this study, together with the unlabeled competitor and helper (H-) probes.

Probe	Sequence (5′–3′)	Specificity	E.coli target position	Label	Reference
EUB338-I	GCTGCCTCCCGTAGGAGT	Eubacteria	16S rRNA 338–355	HRP	62
NON-EUB338-I	ACTCCTACGGGAGGCAGC	Eubacteria Negative control	16S rRNA 338–355	HRP	63
BET42a	GCCTTCCCACTTCGTTT	Betaproteobacteria	23S rRNA 1027–1043	HRP	64
BET42a competitor	GCCTTCCCACATCGTTT	Gammaproteobacteria	23S rRNA 1027–1043	–	64
ARCH915	GTGCTCCCCCGCCAATTCCT	Archaea	16S rRNA 915–934	HRP	65
BET467	CGTCATGGACGCGGCCTG	C. crambe Betaproteobacteria	16S rRNA 467–484	HRP	This study
H-485	GGCGCTTCTTCTCAGGGTAC	Helper	16S rRNA 485–504	–	This study
H-446	TTCGCCCGCGTTTTTTCTTTC	Helper	16S rRNA 446–466	–	This study