Comprehensive analysis of the ascidian genome reveals novel insights into the molecular evolution of ion channel genes., Okamura Yasushi, Nishino Atsuo, Murata Yoshimichi, Nakajo Koichi, Iwasaki Hirohide, Ohtsuka Yukio, Tanaka-Kunishima Motoko, Takahashi Nobuyuki, Hara Yuji, Yoshida Takashi, and Nishida Motohiro, Physiological genomics, 2005 Aug 11, Volume 22, Issue 3, p.269-82 (2005)