Waseda University

Namiko Ikegaya

Shinji Takeoka

Isao Sakane

Yosuke Obata

Hitoshi Kurumizaka

Naoya Takeda

Syunsuke Saito

The present invention provides a reagent for introducing a protein or gene into a cell. The reagent of the present invention is, for example, a reagent for introducing a protein or gene into a cell, which comprises a composition comprising a cationic amino acid type lipid represented by the following formula (I)-1: (wherein in formula (I)-1: L is a single bond, &#x2014;CONH&#x2014;, or &#x2014;S&#x2014;S&#x2014;; Mis &#x2014;(CH)&#x2014; or &#x2014;(CHCHO)&#x2014; (wherein k is an integer between 0 and 14); and m1 and m2 are each independently an integer between 11 and 21 (in this regard, when providing a reagent for introducing a gene into a cell, the case where both m1 and m2 are 15 is excluded)).

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Tokyo, Japan

Namiko Ikegaya