Allele frequency distribution of the canine dopamine receptor D4 gene exon III and I in 23 breeds

Hideyuki Ito, Hidetoshi Nara, Miho Inoue-Murayama, Makoto K. Shimada, Akiko Koshimura, Yuko Ueda, Hitoshi Kitagawa, Yukari Takeuchi, Yuji Mori, Yuichi Murayama, Mitsuo Morita, Toshiroh Iwasaki, Katuaki Ôta, Yuichi Tanabe, Shin'ichi Ito