Table 2.

Strains used in this study

Strain	Genotype
1B-D1606	MATα ade1-14(UGA) his7-1(UAA) trp1-289(UAG) lys9-A21(UAA) ura3-52 leu2-3,112
5B-D1645	MATa ade1-14(UGA) his7-1(UAA) trp1 ura3 upf1::kanMX4
16A-D1608	MATa ade1-14 his7-1 lys2-87 met13-A1 thr4-B15 trp1 ura3-52 leu2-3,112 SUP35::TRP1
Y06214	MATa his3Δ1 ura3Δ0 leu2Δ0 met15Δ0 upf1::kanMX4
Y01905	MATa his3Δ1 ura3Δ0 leu2Δ0 met15Δ0 upf2::kanMX4
Y04702	MATa his3Δ1 ura3Δ0 leu2Δ0 met15Δ0 upf3::kanMX4
3b-D1658	MATa ade1-14 his3 leu2 lys2 ura3 sup45::HIS3 [pRS316/SUP45]
3v-D1658	MATα ade1-14 his3 leu2 lys2 ura3 sup45::HIS3 [pRS316/SUP45] upf1::kanMX4
4a-D1659	MATα ade1-14 his3 leu2 lys2 ura3 sup45::HIS3 [pRS316/SUP45]
4b-D1659	MATa ade1-14 his3 leu2 lys2 met15Δ ura3 sup45::HIS3 [pRS316/SUP45] upf2::kanMX4
18a-D1660	MATa ade1-14 his3 leu2 ura3 lys2 sup45::HIS3 [pRS316/SUP45]
3a-D1660	MAT α ade1-14 his 3 leu2 ura3 lys2 sup45::HIS3 [pRS316/SUP45] upf3::kanMX4
1A-D1628	MATα ade1-14 his3 lys2 ura3-52 leu2-3,112 trp1 sup45::HIS3 [pRS315/SUP45]
1-1A-D1628	MATα ade1-14 his3 lys2 ura3-52 leu2-3,112 trp1 sup45::HIS3 [pRS315/SUP45] upf1::kanMX