[B042] 单个化学结构文献检索

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        "doi": "10.1007/s00262-011-1007-5",
        "title": "Enhanced programmed death 1 (PD-1) and PD-1 ligand (PD-L1) expression in patients with actinic cheilitis and oral squamous cell carcinoma",
        "author": [
          "John Smith",
          "Jane Doe"
        ],
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          "https://pubmed.ncbi.nlm.nih.gov/39912419"
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        "source": "https://www.tandfonline.com/doi/pdf/10.1080/14756366.2025.2460053",
        "doc_type": "Journal",
        "paper_id": "74e6849a-a4a1-3d18-badc-472c56ba7ae5",
        "epub_date": 20110327,
        "institution": [
          "University of California",
          "Harvard Medical School"
        ],
        "publication": "Cancer Immunology, Immunotherapy",
        "abstract_text": "Programmed death 1 (PD-1) and its ligand PD-L1 are key immune checkpoint molecules...",
        "published_date": 20110701,
        "structure_count": 5
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