this conclusion is based on the observation that the percentage of oocytes with ac-positive follicle cells in gonads incubated in the presence of schistosomin , i.e. , in serum of infected snails ( is ) with dbh , is significantly lower than that in gonads incubated in the absence of schistosomin , i.e. , in serum of noninfected snails ( ns ) with dbh .
C0029045
oocytes
C0018120
follicle