The Rosetta stone is inscribed with a decree issued by the Ptolemaic dynasty, which ruled Egypt from 305 B.C. to 30 B.C. The text is made up of three translations—Greek and two Egyptian scripts (hieroglyphics and demotic script)—of the same passage and enabled scholars to decipher hieroglyphics. The genetic code, deciphered by biochemists, allows the translation of nucleic acid information into protein sequence.