Table 1.

Yeast strains used in this study

Strain	Genotype	Reference
D271	MATa ade2-1 his3 leu2 trp1 ura3	Venema and Tollervey (1996)
YCBA63	MATα as D271 but HIS3-GAL::protA-RRP41	Torchet et al. (2002)
YCA12	MATa ade2-1 his3Δ200 leu2-3,112 trp1-1 ura3-1 can1-100 Kl TRP1::rrp6	Allmang, Petfalski et al. (1999)
rna14.1	MATa ade2-1 his3-11 leu2-3,112 trp1-1 ura3-1 rna14.1	Minvielle-Sebastia et al. (1994)
rna14.2	MATa ade2-1 his3-11 leu2-3,112 trp1-1 ura3-1 rna15.2	Amrani, Dufour et al. (1996)
YCBA121	MATa ade2 his3 leu2 trp1 ura3 rna14.1 HIS3-GAL::protA-RRP41	Torchet et al. (2002)
YCBA128	MATα ade2 his3 leu2 trp1 ura3 rna15.2 HIS3-GAL::protA-RRP41	Torchet et al. (2002)
YCBA132	as rna14.1 but Kl TRP1::rrp6	Torchet et al. (2002)
YCBA134	as rna15.2 but Kl TRP1::rrp6	Torchet et al. (2002)