{"knowledge_schema": {"broad_category": "Biology \u2192 Plant Pathology \u2192 Plant Defense Mechanisms", "refinement": "This problem focuses on the role of specific proteins in plant defense against pathogens, particularly powdery mildew.", "specific_scope": "The question assesses the functions and interactions of the HR4 protein in relation to plant defense mechanisms and its interactions with other proteins.", "goal": "Identify the correct statements regarding the functions and interactions of HR4 in plant defense against pathogens."}, "summary": "This question pertains to the biological functions of the HR4 protein in plant defense mechanisms, specifically against powdery mildew pathogens. It requires evaluating various statements about HR4's interactions and contributions to plant defense. The goal is to determine which of the provided statements about HR4 is true, focusing on its role in actin assembly, pathogen defense, and interactions with other proteins like PAD4."}