A 5-year old girl has a small deletion in chr 22. She has impaired thymus development with a significant deficiency in the number of functional T cells. The most likely etiology for these finding is:

T Cells

Explanation:

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nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides