AF049063 9215 17 1210 from nmt1 AF049063 9215 1108 1116 Escherichia coli lac operon AF049063 9215 1656 2663 from nmt1 AF049063 9215 2663 3863 from fission yeast ars1 AF049063 9215 3864 6973 bla AF049063 9215 6974 9215 Leu2