PROBLEM TO BE SOLVED: To provide a composition allowed to be used for introducing a physiologically active substance into a cell and excellent in biocompatibility and temperature responsiveness, to provide a kit containing the composition and to provide a cell introduction method utilizing the kit.SOLUTION: A molecular aggregate includes a compound (A) expressed by any one of the following formulas DL-G1 to DL-G4 and lipid (B) including a polyethylene glycol structure. DL-G1: R1R2NX(XHR3)XHR4. DL-G2: R1R2NX(X(XHR3)XHR4)2. DL-G3: R1R2NX(X(X(XHR3)XHR4)2)2. DL-G4: R1R2NX(X(X(X(XHR3)XHR4)2)2)2.COPYRIGHT: (C)2014,JPO&INPIT【課題】生理活性物質を細胞内に導入するために使用できる、生体適合性及び温度応答性に優れた組成物、それを含有するキット及びそれを利用した細胞導入方法を提供する。【解決手段】(A)下記式DL-G1~DL-G4のいずれかで表される化合物;及び(B)ポリエチレングリコール構造を含有する脂質を含有する、分子集合体。DL-G1:R1R2NX(XHR3)XHR4DL-G2:R1R2NX(X(XHR3)XHR4)2DL-G3:R1R2NX(X(X(XHR3)XHR4)2)2DL-G4:R1R2NX(X(X(X(XHR3)XHR4)2)2)2【選択図】なし
