Induction of integration-free human-induced pluripotent stem cells under serum- and feeder-free conditions. - Hamada A; Akagi E; Yamasaki S; Nakatao H; Obayashi F; Ohtaka M; Nishimura K; Nakanishi M; Toratani S; Okamoto T (In vitro cellular & developmental biology. Animal, 2020)