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Changes of CBF in response to vitamin B12. Ciliary beat frequency of cultured human nasal epithelial cells, measured before and every 1 min after treatment with 0.01% (n = 8, green dotted line), 0.10% (n = 8, blue dotted line) and 1.00% (n = 8, red dotted line) vitamin B12, or HBSS (n = 8, black dotted line) over 20 minutes. *P < 0.05, vs. 0 min of each group.
