β-Cell pre-mir-21 induces dysfunction and loss of cellular identity by targeting transforming growth factor beta 2 (Tgfb2) and Smad family member 2 (Smad2) mRNAs oleh Sara Ibrahim, Macey Johnson, Clarissa Hernandez Stephens, Jerry Xu, Rachel Moore, Andrea Mariani, Christopher Contreras, Farooq Syed, Raghavendra G. Mirmira, Ryan M. Anderson, Emily K. Sims