Files in this Data Supplement:

• Supplemental file 1 - Supplemental file 1 - Supplemental materials and methods
  Fig. S1(Expression characterization of DMPK mutants)
  Fig. S2 (NE immunolocalization of YFP-mDMPK A mutants)
  Fig. S5 and Table S1 (Comparative analysis of mouse and human DMPK C termini)
  Fig. S6 (Expression of hDMPK A and C in C2C12 cells).
  Zipped MS Word document.
• Supplemental file 2 - Supplemental file 2 - Supplemental Movies S3A and B (Real-time analysis of YFP-mDMPK A associated with the ER)
  Movie S4 (Real-time analysis of CFP-mDMPK C associated with mitochondria).
  Zipped movie.