Huntingtin (HTT) gene https://ghr.nlm.nih.gov/gene/HTT mutated HTT mutated HTT HTT protein function is unknown huntingtin huntingtin protein https://ghr.nlm.nih.gov/gene/HTT mutated HTT HTT gene HTT function is unknown NIH HTT function is unknown huntingtin protein function is unknown https://ghr.nlm.nih.gov/gene/HTT HTT HTT https://ghr.nlm.nih.gov/gene/HTT https://ghr.nlm.nih.gov/gene/HTT Huntingtin (HTT) gene huntingtin https://ghr.nlm.nih.gov/gene/HTT function is unknown https://ghr.nlm.nih.gov/gene/HTT https://ghr.nlm.nih.gov/gene/HTT