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Bush et al

This article originally appeared on Time.com .

They mainly work by using a combination of the hormone estrogen and progestin (a synthetic version of the steroid hormone progesterone) to affect a womans hormone levels and prevent the ovaries from releasing mature eggs by making the body think it is pregnant 2

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United States patent US2017/0295848 A1 (2017)

2) damaged mitochondria accumulate specific membrane proteins or receptors, potentially forming ubiquitin chains, thereby releasing eat me signals that prompt the cell to initiate mitophagy, with autophagosome membrane proteins recognizing and binding to these signals, subsequently encapsulating the mitochondria within double-membrane phagophores to form autophagosomes