{"knowledge_schema": {"broad_category": "Biochemistry \u2192 Post-Translational Modifications \u2192 Protein Modification", "refinement": "This problem focuses on identifying specific modifications to proteins, particularly lactylation of lysine residues in the context of cancer research.", "specific_scope": "The task involves analyzing mass spectrometry data to determine the m/z value that corresponds to the lactylation of a lysine residue in a specific peptide sequence.", "goal": "Select the correct m/z value from the provided measurements that confirms the presence of lysine lactylation."}, "summary": "This problem involves biochemistry, specifically the identification of post-translational modifications of proteins through mass spectrometry. The scenario describes the lactylation of lysine in a peptide sequence, and the task is to analyze measured m/z values to find the one that indicates this modification. The goal is to select the correct m/z value from the options provided that confirms lysine lactylation."}