Upregulation of PTEN by peroxynitrite contributes to cytokine-induced apoptosis in pancreatic β-cells - Rongrong Hou; Jing Zhang; Tao Yin; Hongwei Cao; Nanyan Zhang; Xiaomiao Li; Li Wang; Ying Xing; Deqiang Li; Qiuhe Ji (Apoptosis, 2010)