Supplemental Material for the above-noted paper should have included these elements only: Supplemental File 1, nine Supplemental Tables, and one Supplemental Figure.
The lone citation to Supplemental File 2 has been removed (p.1069), the lone citation to Supplemental File 3 (p.1073) has been changed to Supplemental Table S9 instead, and Supplemental File 1, which was missing originally, is now cited on pages 1064 and 1068 and can be found in the Additional Supplemental Material link online.
The paper has been corrected online, and the authors apologize for any confusion this may have caused.
doi: 10.1261/rna.072926.119