The present study showed , for the first time , the expression levels of genes involved in the cytoplasmic maturity ( BMP15 , GDF9 ) , adenosine triphosphate production ( ATPase 6 ) , and antiapoptotic process ( NAIP ) , in human GV oocytes were significantly higher in the GnRH-anta group than in the GnRH-a group in COS. .