Although genes are recognized as influencing behavior and
cognition, "genetically identical" does not mean altogether
identical; identical twins, despite being natural human clones
with identical DNA, are separate people, with separate
experiences and not altogether overlapping personalities. The
relationship between an "original" and a clone is rather like
that between identical twins raised apart; they share all the
same DNA, but little of the same environment. A lively
scientific debate on this topic occurred in the journal Nature
in 1997. Ultimately, the question of how similar an original and
a clone would be boils down to how much of personality is
determined by genetics, an area still under active scientific
investigation. (See nature versus nurture and cloning.) The most
successful common cloning technique in non-human mammals is the
process which produced Dolly the sheep. It is also the technique
used by Advanced Cell Technology (ACT), the first company to
successfully clone early human embryos that