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A schematic showing the potential variability in hormonal concentrations between MC. Drawn using data from Ref. 6. A normal MC with lower (A), average (B), and higher (C) levels of estrogen and progesterone throughout the MC. D: MCs with varying hormone concentrations (MC 1–3) plotted on a single graph to highlight the variability in hormone levels across MCs, showcasing variations within and between individuals. E2, estradiol; MC, menstrual cycle; P4, progesterone.
