From an article in the WSJ, titled "Scientists Cook Up Lab-Grown Beef," the piece ends with this:
Lab-grown beef isn't considered a genetically modified food because the cells in the meat are derived from the same stem cells that grow into muscle cells in cows. Dr. Post said such meat should be as safe as regular beef but that it would take years to know the effect on humans.
Well, if they say so.
Read it all here: http://online.wsj.com/article/SB10001...
Side question: will vegetarians eat this?