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PFA fixed cryosectioned Riftia pachyptila specimen (# 1095). (a) Rp1752 probe in Cy3 targeting host 18S rRNA, (b) Univ1390 in Fluos (c) DAPI staining of DNA, (d) overlay of images a, b and c (b, bacteriocyte; p, peritoneum). Scale bar = 50 μm.