{
  "description": "EFetch example: Retrieve abstracts for specific PubMed articles in JSON-compatible format",
  "request": {
    "method": "GET",
    "url": "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi",
    "parameters": {
      "db": "pubmed",
      "id": "36328499,36328500",
      "rettype": "abstract",
      "retmode": "xml"
    }
  },
  "notes": "EFetch returns XML for PubMed articles. The rettype=abstract with retmode=xml returns PubmedArticleSet XML. Use rettype=medline and retmode=text for MEDLINE flat file format. The response below shows a simplified representation of the XML structure.",
  "response_structure": {
    "PubmedArticleSet": {
      "PubmedArticle": [
        {
          "MedlineCitation": {
            "PMID": "36328499",
            "Article": {
              "Journal": {
                "Title": "Nature",
                "JournalIssue": {
                  "Volume": "612",
                  "Issue": "7941",
                  "PubDate": { "Year": "2022", "Month": "Dec" }
                }
              },
              "ArticleTitle": "Example article title about CRISPR gene editing",
              "Abstract": {
                "AbstractText": "Abstract text describing the study methods, results, and conclusions."
              },
              "AuthorList": {
                "Author": [
                  {
                    "LastName": "Smith",
                    "ForeName": "Jane",
                    "Initials": "J",
                    "AffiliationInfo": {
                      "Affiliation": "Department of Genetics, University of California, Berkeley, CA, USA"
                    }
                  }
                ]
              },
              "Language": "eng",
              "PublicationTypeList": {
                "PublicationType": ["Journal Article", "Research Support, N.I.H., Extramural"]
              },
              "ArticleIdList": {
                "ArticleId": [
                  { "IdType": "pubmed", "value": "36328499" },
                  { "IdType": "doi", "value": "10.1038/s41586-022-05543-x" },
                  { "IdType": "pmc", "value": "PMC9876543" }
                ]
              }
            },
            "MeshHeadingList": {
              "MeshHeading": [
                {
                  "DescriptorName": "CRISPR-Cas Systems",
                  "MajorTopicYN": "Y"
                },
                {
                  "DescriptorName": "Gene Editing",
                  "MajorTopicYN": "Y"
                }
              ]
            }
          }
        }
      ]
    }
  }
}