4PPI:
reference: Structural transition in Bcl-xL and its potential association with mitochondrial calcium ion transport., Rajan S, Choi M, Nguyen QT, Ye H, Liu W, Toh HT, Kang C, Kamariah N, Li C, Huang H, White C, Baek K, Gruber G, Yoon HS, Sci Rep. 2015 May 29;5:10609. doi: 10.1038/srep10609. PMID: 26023881

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