Notably, although the first clones were frogs, no adult cloned frog has yet been produced from a somatic adult nucleus donor cell.
2.
This allows a skilled technician to grab an egg cell under a microscope, suck out its nucleus with a fine needle and then inject an adult nucleus using another needle.
3.
"I am not convinced that any adult nucleus has been reprogrammed completely enough to give a fully viable animal, and certainly not with any efficiency, " said Dr . Norton D . Zinder, a Rockefeller University biologist who has taken a skeptical interest in cloning.
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