tokens: We have attempted to clone two recessive extragenic suppressors of such ts mutants ( sdp1 for mutation pol3 - 14 and sdp5 - 1 for mutation pol3 - 11 ) by transforming thermoresistant haploid strains pol3 - 14 sdp1 and pol3 - 11 sdp5 - 1 with wild - type genomic libraries in singlecopy or multicopy vectors .