Fig. 2. Photomicrographs of iron precipitate samples. (A) Stained with 4',6-diamidino-2-phenylindole (DAPI) (top) and hybridized with universal probe Univ-1392 (bottom). (B) stained with DAPI (top) and hybridized with eukaryotic universal probe Euk 502 (bottom). (C) Stained with DAPI (top) and hybridized with bacterial universal probe EUB338 (bottom). Scale bar marker: 10 µm.