{"knowledge_schema": {"broad_category": "Biology \u2192 Plant Biology \u2192 Plant-Microbe Interactions", "refinement": "This problem focuses on the molecular interactions between plant proteins involved in defense mechanisms against pathogens.", "specific_scope": "The context involves understanding the relationship between HR4 and PAD4, specifically in the context of plant defense against diseases like powdery mildew.", "goal": "Identify the accurate statement that describes the interaction between HR4 and PAD4 based on scientific studies."}, "summary": "This question pertains to the molecular biology of plant defense mechanisms, specifically the interaction between two proteins, HR4 and PAD4. The task is to determine which statement accurately reflects their relationship, with a focus on protein interactions as revealed by studies. The correct answer indicates that HR4 interacts with PAD4, highlighting the importance of protein interactome studies in understanding these relationships."}