the average dissolution time of the zona pellucida increased in proportion to the holding time of oocytes in oviducts : 9.9 , 13.8 , 48.3 , 239.3 and 788.3 min after 5 , 20 , 40 , 80 and 120 min in the oviduct , respectively .
C0043519
zona pellucida
C0029045
oocytes