A Giant Step in Cloning
mernil writes "The Independent reports: "A technical breakthrough has enabled scientists to create for the first time dozens of cloned embryos from adult monkeys, raising the prospect of the same procedure being used to make cloned human embryos."
Here is the BBC News article since the original article seems to be down. http://news.bbc.co.uk/2/hi/science/nature/7094215.stm
The basic principle is that the highly-ordered molecules on which the chromosomes are mounted are birefringent (they change the polarization-state of light), so if you know what the original polarization state was and if you can measure the state afterwards, then you can detect those molecules, even though they are transparent. As the BBC article says, this means you don't need to use toxic dyes to find them (which is obviously a bad idea, if you want the egg to actually survive the process).