In protein chemistry, protean describes a protein that has been slightly denatured and has become insoluble as a result. The mild unfolding disturbs the protein’s native shape just enough for hydrophobic regions to be exposed, so molecules clump together and fall out of solution instead of staying dissolved. This sits at the early end of denaturation: harsher treatment would destroy structure completely, while here the change is limited but irreversible enough to alter solubility. Food technologists meet protean states when proteins are heated, acidified, or sheared during processing, for example in the first stages of egg-white setting or milk protein aggregation. Controlled partial denaturation is deliberately used to build texture in gels, foams, and meat products.