1.   Michael Land of Sussex University, our foremost authority on invertebrate eyes, is worried, and so am I.

2.   And even though the survivors are easily fertilized, the resulting embryos rarely develop properly.

3.   As a scientist, her purpose is to understand how embryos develop.

4.   Because the researchers do not know how to manipulate embryonic stem cells from cows, they let the cow embryos develop into fetuses, Lanza said.

5.   But he wanted to study how the embryo developed, and it was easier and ethically necessary to do so in mice rather than people, he said.

6.   Far more mouse embryos develop successfully on these devices than by traditional methods.

7.   It is from these cells that the embryo develops.

8.   One hurdle remaining in the process is that scientists cannot yet predict which embryos will develop into high producers of the protein-laden milk.

9.   Researchers there must obtain a license before they can clone embryos and are prohibited from allowing the embryos to develop beyond their first two weeks.

10.   Some embryos developed to the stage known as a blastocyst, but by day six or seven they had started to look abnormal.