There actually is a company that has a microorganism-produced casein that's on the market and can be bought as vegan ice cream at Smitten in the Bay Area: https

There actually is a company that has a microorganism-produced casein that's on the market and can be bought as vegan ice cream at Smitten in the Bay Area: https://www.perfectdayfoods.com/ https://www.perfectdayfoods.com/ Then there's the Real Vegan Cheese project in the East Bay, which isn't venture funded and therefor seems to be moving a bit more slowly: https://www.indiegogo.com/projects/real-vegan-cheese#/ https://www.indiegogo.com/projects/real-vegan-cheese#/