Because identical twins come from a single fertilized egg that splits into two, they share virtually the same genetic code.

由于同卵双胞胎来自于一个分裂成两个的受精卵，他们实际上共享相同的遗传密码。

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Identical twins result when a fertilized egg splits into two embryos.

CNN: Texas woman has 2 sets of identical twins

Dan and Scott Shillum are identical twins, genetic clones produced from the accidental division of a single fertilised egg into two embryos in their mother's womb some 40 years ago.

BBC: 'Not-so-identical' twins may hold the key to disease