"shuttle vector" meaning in English

{
  "forms": [
    {
      "form": "shuttle vectors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shuttle vector (plural shuttle vectors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Cytology",
          "orig": "en:Cytology",
          "parents": [
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A vector constructed, usually with selectable markers and tags, so that it can propagate in two different host species."
      ],
      "id": "en-shuttle_vector-en-noun-wbcsNNPK",
      "links": [
        [
          "cytology",
          "cytology"
        ]
      ],
      "raw_glosses": [
        "(cytology) A vector constructed, usually with selectable markers and tags, so that it can propagate in two different host species."
      ],
      "topics": [
        "biology",
        "cytology",
        "medicine",
        "natural-sciences",
        "sciences"
      ],
      "wikipedia": [
        "shuttle vector"
      ]
    }
  ],
  "word": "shuttle vector"
}

{
  "forms": [
    {
      "form": "shuttle vectors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shuttle vector (plural shuttle vectors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Cytology"
      ],
      "glosses": [
        "A vector constructed, usually with selectable markers and tags, so that it can propagate in two different host species."
      ],
      "links": [
        [
          "cytology",
          "cytology"
        ]
      ],
      "raw_glosses": [
        "(cytology) A vector constructed, usually with selectable markers and tags, so that it can propagate in two different host species."
      ],
      "topics": [
        "biology",
        "cytology",
        "medicine",
        "natural-sciences",
        "sciences"
      ],
      "wikipedia": [
        "shuttle vector"
      ]
    }
  ],
  "word": "shuttle vector"
}