Table I. Yeast strains.

Strain	Genotype	Source
C301	MATα, his3, leu2, trp1, met4::TRP1, ura3::GAL1-GFPMET4::URA3	this study
C302	MATα, his3, leu2, trp1, met30-2, ura3::GAL1-GFPMET4::URA3	this study
C312	MATα, his3, leu2, trp1, ura3::GAL1-GFPMET4::URA3	this study
C319	MATα, his3, leu2, trp1, cdc34-2, ura3::GAL1-GFPMET4::URA3	this study
C323	MATα, his3, leu2, trp1, cdc53-1, ura3::GAL1-GFPMET4::URA3	this study
C327	MATα, his3, leu2, trp1, skp1-11, ura3::GAL1-GFPMET4::URA3	this study
CC640-6C	MATα, his3, leu2, trp1, met30-2	this study
CC653-3C	MATa, ade2, his3, leu2, trp1,ura3, met4::TRP1, cbf1::TRP1	this study
CC807-1C	MATa, ade2, his3, leu2, trp1,ura3, met4::TRP1, met30::LEU2	Patton et al. (1999)
CC849-8A	MATα, ade2, his3, leu2, trp1,ura3, met4::TRP1	this study
CC857-2A	MATa, ade2, his3, leu2, trp1,ura3, cbf1::TRP1	this study
CD130-7D	MATα, ade2, his3, leu2, trp1,ura3, met28::LEU2	H.Chérest
CD168	MATα, ade2, his3, leu2, trp1, ura3, met31::LEU2, met32::HIS3	Blaiseau and Thomas (1998)
CD179	MATα, ade2, his3, leu2, trp1,ura3, met31::LEU2 met32::TRP1	Blaiseau and Thomas (1998)
CMY763	MATα, leu2, ura3, cim3	Ghislain et al. (1993)
CMY765	MATα, leu2, ura3, cim5	Ghislain et al. (1993)
MT1166	MATa, ade2, his3, leu2, trp1, ura3, skp1-11	Patton et al. (1998)
MT670	MATa, ade2, his3, leu2, trp1, ura3, cdc34-2	Patton et al. (1998)
MT871	MATa, ade2, his3, leu2, trp1, ura3, cdc53-1	Patton et al. (1998)
YPH499	MATa, ade2, his3, leu2, lys2, trp1, ura3	Ghislain et al. (1993)
W303-1A	MATa, ade2, his3, leu2, trp1, ura3	R.Rothstein