You are testing protein X and protein Y in a yeast two-hybrid assay that uses lacZ as a reporter gene. Production of a blue product signifies that:

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The yeast two-hybrid assay is a molecular biology technique used to detect protein-protein interactions. In this assay, the interaction between two proteins (in this case, protein X and protein Y) brings together two halves of a transcription factor needed to activate the expression of a reporter gene, such as lacZ. When lacZ is expressed, it produces a blue product if its substrate is present, indicating that protein X interacts with protein Y.

You Are Testing Protein X and Protein Y in a Yeast