For the Record - Aug. 26, 2007

“Chasing memory”: The glossary accompanying the Aug . 19 memory article in Section A defined genes as “strings of amino acids that make up an organism’s genome, a sort of blueprint from which the organism is built. Individual genes are strings of amino acids; each string contains instructions for building a particular protein.” The definition should have said: “Genes: strings of DNA that form a blueprint from which the organism is built. Each gene contains instructions for building a particular protein.”