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Light microscope images of HrT18G cells with or without exposure to bear tissue extracts. A (5X) & B (10X): mock infected HrT-18G cells at day 4 post-infection. C (5X) &D (10X): HrT-18G cells infected with B1 bear tissue extracts at day 4 post-infection. E &F: HrT-18G cells exposed to O1 tissue extract at day 4 post-infection (E), and at day 8 post-infection (F).
