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UV autofluorescence detection of E. necatrix oocyst walls. (A) Oocyst wall visualized under bright-field. (B) The same oocyst wall visualized under 330- to 385-nm UV light. (C) The same oocyst wall visualized under 520- to 550-nm light, which could not be detected by red fluorescence. Images photographed at × 1 000 magnification.
