In the Stern and McClintock (1998) study, swabs were taken from the underarms of women at different points in their menstrual cycle. These swabs were presented to other women, most of whom reported they could not smell the substance, even though their own menstrual cycles were modified. This research suggests that

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The study suggests that humans can be influenced by pheromones, as the swabs from the underarms of women at different points in their menstrual cycle influenced the menstrual cycles of other women who could not even smell the substance.

In the Stern and McClintock (1998) Study, Swabs Were Taken