By separation the embryo

                                        Cow 1

 Step one

Take out the fertilized ovum from Cow 1

 Step two

Wait for the cell  divide into four.

 Step three

Then put the ovum back into Cow 1.

 Step four

These four twins has the same DNA.

( Picture and information is from : http://library.thinkquest.org/20015/haibunkatsu.html  )

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