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É na medula óssea que são produzidas as células sanguíneas: glóbulos brancos , glóbulos vermelhos e as plaquetas. A leucemia acontece quando uma célula sanguínea, que não atingiu a maturidade, sofre uma mutação genética se transformando em uma célula cancerosa. Essa célula não funciona de forma adequada, multiplica-se mais rápido e morre menos do que as células normais e, assim, vão substituindo as células saudáveis.
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Leucócitos T, ou linfócitos T, são glóbulos brancos especializados, produzidos na medula óssea e amadurecidos no timo, cruciais para a imunidade adaptativa. Eles patrulham o corpo, reconhecendo e combatendo patógenos intracelulares , células cancerígenas e regulando a resposta imune, dividindo-se principalmente em auxiliares e citotóxicos .
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