| The addition of the c myc epitope at the C terminus of Arf 1 resulted in a mutant ( arf 1 myc arf 2 ) that supported vegetative growth and rescued cells from supersensitivity to fluoride , but homozygous diploids failed to sporulate . arf 1 myc arf 2 mutants completed both meiotic divisions but were unable to form spores . ^^^ |