The clam embryo protein cyclin A induces entry into M phase and the resumption of meiosis in Xenopus oocytes.
Swenson KI, Farrell KM, Ruderman JV. The clam embryo protein cyclin A induces entry into M phase and the resumption of meiosis in Xenopus oocytes. Cell. 1986 Dec 26; 47(6):861-70.