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We read the article of Clemson et al1 about a new treatment for retinitis pigmentosa (RP) with great interest. However, the authors' claim that their data suggest that valproic acid (VPA) may be an effective treatment for RP is unfounded and also regrettably misleading for the many desperate RP patients. In fact, we …
Competing interests None to declare.
Provenance and peer review Not commissioned; not externally peer reviewed.