Increased interleukin-1 and interleukin-1 receptor antagonist levels in cervical mucus in the ovulatory phase in comparison with the follicular phase. - Kanai,T.; Fukuda-Miki,M.; Shimoya,K.; Azuma,C.; Hashimoto,K.; Nobunaga,T.; Tokugawa,Y.; Tsujimoto,M.; Saji,F.; Murata,Y. (Gynecol Obstet Invest, 1997)