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Arama, Eli; Bader, Maya; Srivastava, Mayank; Bergmann, Andreas; Steller, Hermann. (2005). The two Drosophila cytochrome C proteins can function in both respiration and caspase activation. , 25(1), 232–243. doi:10.1038/sj.emboj.7600920 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research