<qa>  What is the anticonvulsant valproic acid?There are several lines of evidence suggesting HDAC inhibitors cross the BBB. The anticonvulsant valproic acid, a member of the short chain fatty acid class of HDAC inhibitors, has a well-recognized capacity to cross the BBB. HDAC inhibitors are also being studied in Huntingtons disease. Panobinostat is able to cross the blood-brain-barrier and influence gene expression in rodents. 