In the X-SCID gene therapy trial in which some of the patients developed leukemia,the "good copy" of the gene probably inserted near a(n)________ gene.

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The "good copy" of the gene in the X-SCID gene therapy trial likely inserted near a tumor promoter gene, which can activate genes involved in cell growth and division, leading to the development of leukemia. This type of integration can result in the activation of proto-oncogenes, which are normally dormant, and drive uncontrolled cell growth. Short tandem repeats (A) are regions of DNA with repeating nucleotide sequences, not genes. The immune system (B) is not directly related to the site of gene insertion in this case. Housekeeping genes (C) are involved in basic cellular functions and are unlikely to play a role in the development of leukemia.

In the X-SCID Gene Therapy Trial in Which Some of the Patients