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Deletion of either SSE1 or FES1 disrupt [URE3] propagation. (A) BY241 [URE3-1] deleted for the indicated genes streaked on ½ YPD. Red color indicates loss of [URE3]. (B) Strain 5V-H19 with [PSI+]strong or [PSI+]weak, sse1Δ derivatives and a guanidine-cured derivative and diploids with the wild-type [psi-] strain 62δ-1DC were streaked on ½ YPD. White color indicates the presence of [PSI+].
