1.   Dr. Jacques Cohen and Willadsen, at St. Barnabas, also have moved nuclei between cells, but for a different reason.

2.   In moving the nucleus, the microtubules also transport a third maternal message, called gurken, from the posterior to a point toward the front pole.

3.   So far, Grifo has shown that he can move egg nuclei around, which is, in essence what is required for cloning.

4.   The difficulty lies not so much in actually moving nuclei about or manipulating embryos, but in understanding what goes wrong along the way.