"checkpoint protein" meaning in English

{
  "forms": [
    {
      "form": "checkpoint proteins",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "checkpoint protein (plural checkpoint proteins)",
      "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": "Proteins",
          "orig": "en:Proteins",
          "parents": [
            "Biomolecules",
            "Biochemistry",
            "Body parts",
            "Organic compounds",
            "Biology",
            "Chemistry",
            "Body",
            "Anatomy",
            "Matter",
            "Sciences",
            "Human",
            "Medicine",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A protein that halts a cellular process until certain other processes are complete"
      ],
      "id": "en-checkpoint_protein-en-noun-HRsFDt5G",
      "links": [
        [
          "biochemistry",
          "biochemistry"
        ],
        [
          "protein",
          "protein"
        ],
        [
          "cellular",
          "cellular"
        ],
        [
          "process",
          "process"
        ]
      ],
      "raw_glosses": [
        "(biochemistry) A protein that halts a cellular process until certain other processes are complete"
      ],
      "topics": [
        "biochemistry",
        "biology",
        "chemistry",
        "microbiology",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "checkpoint protein"
}

{
  "forms": [
    {
      "form": "checkpoint proteins",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "checkpoint protein (plural checkpoint proteins)",
      "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:Proteins"
      ],
      "glosses": [
        "A protein that halts a cellular process until certain other processes are complete"
      ],
      "links": [
        [
          "biochemistry",
          "biochemistry"
        ],
        [
          "protein",
          "protein"
        ],
        [
          "cellular",
          "cellular"
        ],
        [
          "process",
          "process"
        ]
      ],
      "raw_glosses": [
        "(biochemistry) A protein that halts a cellular process until certain other processes are complete"
      ],
      "topics": [
        "biochemistry",
        "biology",
        "chemistry",
        "microbiology",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "checkpoint protein"
}