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  "Title": "'Entrez' in R",
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    "entrez_fetch",
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      ]
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        "entrez_db_links"
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        "entrez_db_searchable"
      ]
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        "entrez_db_summary"
      ]
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      "concept": [
        "einfo"
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        "entrez_dbs"
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      "topics": [
        "entrez_fetch"
      ]
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      ]
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      "concept": [
        "einfo"
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      "topics": [
        "entrez_info"
      ]
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      "topics": [
        "entrez_link"
      ]
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      "title": "Post IDs to Eutils for later use",
      "topics": [
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      ]
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      "title": "Search the NCBI databases using EUtils",
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        "Introduction: The NCBI, entrez and rentrez.",
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        "Searching databases: entrez_search()",
        "Building search terms",
        "Using the Filter field",
        "Advanced counting",
        "Finding cross-references : entrez_link():",
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        "External links",
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        "Get a web_history object from entrez_search or entrez_link()",
        "Use a web_history object",
        "Rate-limiting and API Keys",
        "Slowing rentrez down when you hit the rate-limit",
        "What next ?"
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