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S. ludwigii produces a pheromone with an activity similar to that of S. cerevisiae a-factor. Halo assays were performed by patching the indicated strains onto a lawn of MATα S. cerevisiae or MATλ S. ludwigii cells. The secreted L-factor from S. ludwigii is recognized by the receptor on S. cerevisiae, but not vice versa, as discussed in the text.
