The Japanese Society of Animal Reproduction (JSAR) is pleased to announce the Awardees of "Journal of Reproduction and Development (JRD) Outstanding Paper Award in 2007." The JRD Outstanding Paper Award is given to the first authors of the papers that showed the most outstanding research outcomes during the volume year. The Awardees will be presented the certificate of commendation and monetary prize of 30,000 Japanese yen. The JRD Editorial Board carefully reviewed the papers and determined the Awardees in 2007. The Awardees and the titles of the papers selected are as follows (in alphabetical order).