Table 2. FISH probes used in this study, percentage of formamide in hybridization buffer, and target groups.

Probe	Sequence (5′ – 3′)	% Formamide	Target	Reference
EUB338	GCTGCCTCCCGTAGGAGT	30	Most eubacteria	Amann et al. 1990 [59]
GAM42	GCCTTCCCACATCGTTT	30	Gammaproteobacteria	Manz et al.1992 [60]
Creg821	GTACCCCCCCCAACGACT	30	Thiotrophic symbionts of Christineconcha regab	This study
Lchu821	GTAAATCCCCCCAACGGCT	30	Thiotrophic symbionts of Laubiericoncha chuni	This study