PROBLEM TO BE SOLVED: To provide a substance capable of safely and effectively modulating expression of a Period gene.SOLUTION: An expression modulator for a Period gene contains Pelargonium plant extract as an active ingredient.COPYRIGHT: (C)2014,JPO&INPIT【課題】安全かつ効果的にPeriod遺伝子発現を調節できる物質を提供する。【解決手段】ペラルゴニウム属植物の抽出物を有効成分として含有するPeriod遺伝子発現調節剤。【選択図】図2