Proteins That May Restore Damaged Sound-Detecting Cells in the Ear
i remember about a call for volunteers for an experiment treating hearing loss with some proteins and/or adenoviruses (not a specialist). this was a couple of years ago and it sounded pretty much exactly like what this article describes. a 90% success rate was expected.as this was in the u.s. (washington dc, iirc?) and i'm not a citizen i didn't apply. i thought it to be a game changer, but found no follow up articles.the original search even was on HN, but i have little hope of finding it again.edit, after a little bit of googling:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4464776/ and 
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5225386/