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</html><thumbnail_url>https://www.invitra.com/en/wp-content/uploads/2022/02/luteal-phase.png</thumbnail_url><thumbnail_width>2400</thumbnail_width><thumbnail_height>1020</thumbnail_height><description>The luteal phase is a phase of a woman's menstrual cycle in which her body prepares for a possible pregnancy. If pregnancy does not occur, the end of the luteal phase triggers menstruation and the beginning of the next menstrual cycle. The corpus luteum and the secretion of progesterone is the most characteristic feature of this phase.</description></oembed>
