NOVEL DEVICES IN BIOLOGY. “Other aspects of functional modules are less familiar to engineers. Several can be subsumed under the idea that the rules for a module’s function are rigidly encoded in the structures of its proteins, but produce messy, probabilistic intermediates that are then refined to give unique solutions. This principle seems to hold across an enormous range of scales, from the folding of protein molecules to the evolution of organisms.”
https://www.nature.com/articles/35011540