Proteins aren’t entirely fungible, no. Some of them have things in common, though, sometimes enough to do similar things. Industrial protein use doesn’t need to

Proteins aren’t entirely fungible, no. Some of them have things in common, though, sometimes enough to do similar things. Industrial protein use doesn’t need to be precise enough for life. There are research teams in Japan, the US, and the UK working on making plastics and building materials out of mycelium or mycelium and cellulose.