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The first clinical gene therapy in 1990 treated a girl with a deficiency of:
AAdenosine deaminase
BRecombinant insulin
CBlood haemoglobin
DVitamin A reserves
Answer & Solution
Correct answer: A. Adenosine deaminase
1. The enzyme is crucial for the immune system.
2. Its gene was deleted in the patient.
3. She lacked adenosine deaminase.
_Source: NCERT Class 12 Biology, Chapter 12, Biotechnology and its Applications._
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