We cells manufacture upward of 600 enzymes - most remarkable - substances. On order from RNA, these master chemists instantly and effortlessly synthesize proteins - taking protein from a piece of fish, breaking it down into its components and rearranging the amino acids to make the human protein needed for, say, your thumbnail. Cellular enzymes also build bafflingly complex hormones and disease-fighting antibodies and perform many tasks beyond the capabilities of the world’s most gifted chemists.