"Philadelphia chromosome" meaning in English

{
  "etymology_text": "The abnormality was first discovered and described in 1959 by David Hungerford from the Institute for Cancer Research and Peter Nowell from the University of Pennsylvania School of Medicine. Both facilities are located in Philadelphia, Pennsylvania.",
  "forms": [
    {
      "form": "Philadelphia chromosomes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Philadelphia chromosome (plural Philadelphia chromosomes)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Human chromosome 22, after it has, pathologically, traded some of its genetic material with chromosome 9; this often causes chronic myelogenous leukemia."
      ],
      "id": "en-Philadelphia_chromosome-en-noun-gOdVItaX",
      "links": [
        [
          "Human",
          "human"
        ],
        [
          "pathologically",
          "pathologically"
        ],
        [
          "genetic",
          "genetic"
        ],
        [
          "chronic myelogenous leukemia",
          "chronic myelogenous leukemia"
        ]
      ],
      "synonyms": [
        {
          "word": "Ph chromosome"
        }
      ],
      "wikipedia": [
        "David Hungerford",
        "Fox Chase Cancer Center",
        "Peter Nowell",
        "University of Pennsylvania School of Medicine"
      ]
    }
  ],
  "word": "Philadelphia chromosome"
}

{
  "etymology_text": "The abnormality was first discovered and described in 1959 by David Hungerford from the Institute for Cancer Research and Peter Nowell from the University of Pennsylvania School of Medicine. Both facilities are located in Philadelphia, Pennsylvania.",
  "forms": [
    {
      "form": "Philadelphia chromosomes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Philadelphia chromosome (plural Philadelphia chromosomes)",
      "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",
        "Pages with 1 entry"
      ],
      "glosses": [
        "Human chromosome 22, after it has, pathologically, traded some of its genetic material with chromosome 9; this often causes chronic myelogenous leukemia."
      ],
      "links": [
        [
          "Human",
          "human"
        ],
        [
          "pathologically",
          "pathologically"
        ],
        [
          "genetic",
          "genetic"
        ],
        [
          "chronic myelogenous leukemia",
          "chronic myelogenous leukemia"
        ]
      ],
      "synonyms": [
        {
          "word": "Ph chromosome"
        }
      ],
      "wikipedia": [
        "David Hungerford",
        "Fox Chase Cancer Center",
        "Peter Nowell",
        "University of Pennsylvania School of Medicine"
      ]
    }
  ],
  "word": "Philadelphia chromosome"
}