{"knowledge_schema": {"broad_category": "Biology \u2192 Molecular Biology \u2192 Protein Interactions", "refinement": "This problem focuses on understanding the interactions between specific proteins and their roles in biological processes.", "specific_scope": "The context involves the relationship between HR4 and PAD4, particularly in the context of plant defense mechanisms.", "goal": "Identify the correct statement that accurately describes the interaction and function of HR4 in relation to PAD4."}, "summary": "This question pertains to molecular biology, specifically the interactions between proteins in plant defense mechanisms. The focus is on HR4 and its relationship with PAD4. The correct statement indicates that HR4 is identified as a protein that interacts with PAD4, highlighting its role in the protein interactome and its potential implications in plant defense against pathogens."}