In a message dated 7/25/2006 12:22:50 A.M. Eastern Standard Time,  
[EMAIL PROTECTED] writes:

Yes,  it's murder to kill a twin... if they've been born. But look at  
the  developmental mess that twinning can result in, and the ethical   
conundra that result. Conjoined twins, parasitic twins. See you   
avoided the rest. They're uncomfortable thoughts, aren't they, but   
it's not science fiction. It's been done with other mammals, and I   
wouldn't be at all surprised if there aren't a handful of chimeric   
humans out there.



Human chimeras do exist. (one of set of fraternal twins where one of the  
twin is partially resorbed and incorporated into the other. Sometimes this is  
results in a syndrome called hypermelanosis of eto.  
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