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Confocal observation of six day old Cryptosporidium-exposed biofilm control samples. A) Six day old Cryptosporidium biofilms labelled with only primary antibody seen under transmitted light; B) corresponding confocal image, showing no immunolabeling. C) Six day old Cryptosporidium biofilms labelled with only secondary antibody seen under transmitted light; D) corresponding confocal image, showing no immunolabeling. Scale bars: A&B: 50 μm; C&D: 20 μm.
