Probes targeting bacteria (EUBmix; fluorescein isothiocyanate (green)) and archaea (ARC915; Cy5 (blue)) were used in combination with a probe targeting the Leptospirillum genus (LF655; Cy3 (red)). Overlap of red and green (yellow) indicates Leptospirillum cells and shows the dominance of Leptospirillum. (Banfield Lab, UC Berkeley)