la beta talasemia mayor

ella53

Member
england
Hi,

Im trying to translate the following from a newspaper article referring to the birth of a test-tube baby in Spain:

"Las células madre de su cordon umbilical servirán para curar a su hermano, Andres, que padece una enfermedad congenital, la beta talasemia mayor, de la que él mismo está libre gracias al diagnóstico genético preimplantacional."

Can anybody tell me what the words in bold refer to please?
 
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