21.   It also determined that the tiny bones had already ossified, indicating that the embryo had been close to hatching.

22.   It prohibits experiments on cells and tissues derived from human embryos, even if those embryos are no larger than a single cell.

23.   It is simple to see if the embryo is male, with an X and a Y chromosome, or female, with two X chromosomes.

24.   Knoll said in an interview that the embryos might be the oldest known remains of creatures more complex than sponges and jellyfish.

25.   John R. Horner, a dinosaur paleontologist at the Museum of the Rockies in Bozeman, Mont., praised the discovery because good dinosaur embryos are so rare.

26.   Moreover, the embryos are transparent, allowing a view of their development as it occurs.

27.   One embryo was male, but the analysts were unable to determine whether the hemophilia gene was present.

28.   Or is this embryo deserving of the entirely different, higher level of respect accorded the individual human being?

29.   Past cloning efforts have already demonstrated that cloned embryos are difficult to bring to term, and many that are born carry visible defects, in particular growth abnormalities.

30.   Some embryos are custom made by doctors, while others have been made by doctors for infertile couples and then not used.