Memphis Meats,which grows meat from animal cells,just got a huge endorsement(认可)from some big-named backers.That will take it one step closer to selling its product,but it's still a long way off from hitting store shelves.The five-year-old startup said Wed nesday it raised an other$161 million in a new round of financing.It includes flashy investors like Bill Gates and Richard Branson,as well as meat companies Tyson(TSN)and Cargill.