Table 3.

The targeting efficiency of Ty5 to HM loci in wild-type and Δsir strains

Genotype	Chromosomal events characterized	Effective integration eventsa	Insertions near HM silencers	Percent HM targeting	Fold reduction in HM targeting
Wild-type	200	190	12	6.32	N.A.
Δsir1	200	193	5	2.59	2.44
Δsir2	210	175	3	1.71	3.70
Δsir3	340	300	2	0.67	9.43
Δsir4	230	84	0	N.A.	N.A.

(N.A.) Not applicable. 

^aEffective integration events are calculated as the product of the chromosomal events characterized and the percent chromosomal integration (from Table 1) divided by the sum of the percent chromosomal integration and the percent chromosomal recombination (from Table 1).