"Promoters are very important," says Yu. They are required for genes to express specific functions. Tissue-specific genes and growth phase-regulated genes, for example, require promoters to direct their expression.
「啟動子非常重要，」余淑美解釋，啟動子有如電燈開關，有它帶領，基因才能表現出某些特定功能，而組織專一性（只在某組織表現）與生長時期調控（只在某階段表現），都要仰賴啟動子。