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Symbiotic bacteria in a midgut gland homogenate of P. scaber. The three epifluorescence photomicrographs show the same microscopic field of a preparation stained with DAPI (A) and double-hybridized with oligonucleotide probes specific for Bacteria (EUB338) (B) and for the clones obtained in this study (PsSym352) (C). The hybridization signals of small spherical symbiotic bacteria faded rapidly during the exposure. Scale bar = 2.5 μm.
