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The His-Asp phosphorelay signal transduction from histidine kinase (HK) to the response regulator (RR) is an important mechanism for adaptation to environmental changes. Aspergillus nidulans expresses 15 different HKs, which may be involved in different types of adaptations. As reactive oxygen species (ROS) are a key signal of environmental changes, some HKs might be involved in ROS generation through transcriptional regulation. Previously, we identified 3 HK (NikA, FphA, and HysA) deletion strains that showed increased ROS production during growth. We also