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“Many of the questions came back to the original cells that go into the solution. The rabbi said those cells would have to be kosher, from an animal that was properly slaughtered and not scraped off a live animal. (There is a Jewish law against eating live animals.) This was not well received by some of the clean meat companies, which want to produce something that does not involve killing any animals. The liveliest conversation grew out of research that is looking into whether clean meat might be derived from cells in animal saliva or hair. The rabbi said those substances are not meat, so they might be used to produce clean meat that would not be categorized as meat by Jewish law.”
https://www.nytimes.com/2018/09/30/technology/meat-labs-kosher-bacon.html

Meat Labs Pursue a Once-Impossible Goal: Kosher BaconA rabbi at the world’s largest kosher certification agency is leading an effort to determine if and how meat grown from animal cells can satisfy Jewish law.