HD is caused by a trinucleotide repeat expansion in the Huntingtin (Htt) gene; and is one of several polyglutamine (or PolyQ) diseases.是什么意思_HD is caused by a trinucleotide repeat expansion in the Huntingtin (Htt) gene; and is one of several polyglutamine (or PolyQ) diseases.在线翻译_英语_读音_用法_例句