You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Regarding severe combined immunodeficiency, which is true? and explain in detail?
Severe combined immunodeficiency Constellation of genetically distinct syndromes Defects in both humoral & cell-mediated immune response MC form - XLR - so more in males; mutation in g chain subunit of cytokine receptors Remaining - AR; deficiency of enzyme ADA