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Scatter plot of mPL vs. mF progesterone. Visually ovulatory (• and +) and visually anovulatory (○ and ×) cycles are well separated by a mPL threshold of 110 pmol/liter (dashed horizontal line). Above the dashed diagonal line, mPL > mF. Only those cycles that are visually ovulatory and fall above both dashed lines were included in these analyses.
