"endoskeletons" meaning in English

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          "text": "Their relationships with modern gnathostomes have remained mysterious, partly because their un-mineralized endoskeletons rarely fossilized."
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      "id": "en-endoskeletons-en-noun-QgVpcB59",
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  "word": "endoskeletons"
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  "lang_code": "en",
  "pos": "noun",
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