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American Heritage® Dictionary of the English Languagedefines 'genetherapy'as:"The treatment of certain medical disorders, especially those caused by genetic anomalies or deficiencies, by introducing specific __________________ into a patient's cells."

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Collins English Dictionarydefines'genetherapy'as:"The replacement or alteration of _______________ in order to prevent the occurrence of such inherited diseases as hemophilia. Effected by genetic engineering techniques, it is still at the experimental stage."

Random House Kernerman Webster's College Dictionarydefines'genetherapy'as:"The treatment of a disease by replacing aberrant genes with normal ones, esp. through the use of viruses to transport the ________________ into the nuclei of blood cells."

The American Heritage® Student Science Dictionarydefines'genetherapy'as:"The treatment of disease, esp. one caused by the inheritage of a defective gene, by replacing __________________ with healthy ones through genetic engineering."

In April 2015, Chinese scientists reported results of an attempt to alter the DNA of non-viable human embryos using CRISPR/Cas9 to correct a mutation that causes β-thalassemia. The study had previously been rejected by both Nature and Science in part because of ___________________.