Levonorgestrel decreases cilia beat frequency of human fallopian tubes and rat oviducts without changing morphological structure.

12 , 20 The findings of the present study indicate that, in the presence of LNG, the CBF tended to be lower in the ampulla than in the isthmus during both the proliferative and luteal phase, although the differences did not reach statistical significance for either region between the two stages.

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