tokens: Saccharomyces cerevisiae contains a genetically and biochemically proven CAK gene , CAK1 , that encodes a monomeric 44-kDa Cak1p protein unrelated to Cdk7 .
folded_tokens: saccharomyces cerevisiae contain a genetically and biochemically proven cak gene , cak1 , that encode a monomeric 44-kda cak1p protein unrelated to cdk7 .