EU546817 5900 1290 1574 lacZalpha EU546817 5900 1871 1896 oriC-like EU546817 5900 1974 2060 incompatibility determinant EU546817 5900 2141 3091 repA-ts EU546817 5900 3376 3909 aacC1 EU546817 5900 4345 5148 URA3 EU546817 5900 5387 5900 CEN6/ARSH4 derived from Saccharomyces cerevisiae