[1P-689] The acquisition of mammal-specific polyAAs by POU3F2/BRN2 contributed to mammalian evolution by modifying social behavior. 

^○Makoto Nasu^1,2,3, Yukiko Abe², Aya Matsushima², Atsushi Igarashi², Masashi Yamanaka², Naoyuki Kozuki², Saori Yada², Koichi Hashizume², Meguru Ito², Keiiti Anan^2,3, Den’etsu Sutoo⁴, Kayo Akiyama⁴, Nobuaki Yoshida³, Shintaroh Ueda² (1.Dept. of Health Sci., Fac. of Life Sci., Kumamoto Univ., 2.Dept. of Biol. Sci., Grad. Sch. of Sci., Univ. of Tokyo, 3.IMS, Univ. of Tokyo, 4.Grad. Sch. of Med., Univ. of Tsukuba)