 While researchers in the U.S. tinker with cell-grown burgers, Sriram is focused on shrimp and crab because East and Southeast Asians get most of their animal protein from seafood. Another cultivated meat company, Avant Meats, is perfecting cell-grown fish maw, the puffy swim bladder of a sturgeon. It's very popular in China. But none of this is in the supermarket yet. Only cell-grown chicken is sold in Singapore for now.