Is this claim true? Neither Pepsi nor Senomyx returned calls, so we don't know the companies' side of the story. But a perusal of Senomyx's patents suggests that it may well be. All but 7 of the company's 77 patents refer to the use of HEK 293 (human embryonic kidney) cells, which researchers have used for decades as biological workhorses. (For the bio-geeks among you, these cells offer a reliable way to produce new proteins via genetic engineering.)

The company appears to be engineering HEK cells to function like the taste-receptor cells we have in our mouth. This way, Senomyx can test millions of substances to see if they work as different types of taste enhancers without subjecting human volunteers to endless taste tests.

To non-scientists this may sound a bit strange, but the reality is that HEK 293 cells are widely used in pharmaceutical research, helping scientists create vaccines as well as drugs like those for rheumatoid arthritis. The difference here is that Senomyx's work for Pepsi is one of the first times the cells have (potentially) been used to create a food or beverage. (And it's important to note that no part of a human kidney cell are ever a part of Senomyx's taste enhancers or any finished food products.)

https://www.cbsnews.com/news/pepsis-bizarro-world-boycotted-over-embryonic-cells-linked-to-lo-cal-soda/