[snowstorm12]

An embryo is human and it is alive, but it isn't a human being.

let me ask you this question.
if it was possible, and someone took cells from your liver and they just began differentiating into a new liver, would you call it an organ or potential organ?

[MHGinTN]

...if it was possible, and someone took cells from your liver and they just began differentiating into a new liver ... That's 'magic thinking', very antithetical to science. If someone figures out how to manipulate the liver cells into producing a liver organ, that is science; if the liver cell just starts differentiating, that is magic.

[hocndoc]

An embryo is a human being from fertilization to 8 weeks. He or she is.

If the cells were developing into a liver, I'd think they'd be a liver. A vestigial liver, but a liver. (BTW, We are able to transplant individual lobes of the liver from a living donor to the recipient and each liver piece will regenerate into a more complete liver. I'd think the recipient believes he or she has a liver.)