The 5' leader of the mRNA encoding the mouse neurotrophin receptor TrkB contains two internal ribosomal entry sites that are differentially regulated.
Timmerman SL, Pfingsten JS, Kieft JS, Krushel LA. The 5' leader of the mRNA encoding the mouse neurotrophin receptor TrkB contains two internal ribosomal entry sites that are differentially regulated. PLoS One. 2007 Sep 19; 3(9):e3242.