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Changes of CBF in response to vitamins wash-out. Ciliary beat frequency of cultured human nasal epithelial cells, measured before and after treatment with 1.00% vitamin C (n = 5), or 1.00% vitamin B12 (n = 5) over 20 minutes, followed by another 20 minutes wash-out with Locke Ringer’s solution. *P < 0.05, vs. 20-min time-point of vitamin C treatment, #P < 0.05, vs. 20-min time-point of vitamin B12 treatment.
