Error in Table. In the Neurological Review article titled “Progress and Challenges in RNA Interference Therapy for Huntington Disease” by Harper, published in the August 2009 issue of the Archives (2009;66[8]:933-938), an error occurred in the Table on page 935. In the “Species Specificity” column, the footnote symbol “c” in the row referencing the study by Machida et al should have been omitted.