1.   As part of a study aimed at creating a contraceptive vaccine, they were trying to stimulate antibodies against mouse eggs, which would make the animals infertile.

2.   A contraceptive vaccine is of least interest because there is no money in it.

3.   They were merely trying to make a mouse contraceptive vaccine for pest control.

4.   Zonagen has a worldwide licensing agreement with German pharmaceutical company Schering AG for its contraceptive vaccine.

5.   The company also plans to widen the scope of tests on a contraceptive vaccine being carried out in China with the commission, company official Lars Birgerson said.