16p11.2-p12.2 duplication syndrome; a genomic condition differentiated from euchromatic variation of 16p11.2.

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This study explains that some larger 16p11.2‑p12.2 duplications are a real genetic condition linked to developmental delays, autism, learning differences, and physical traits, while other look‑alike duplications are harmless, helping families and clinicians interpret genetic test results accurately—especially during prenatal testing—and better understand what a duplication may (or may not) mean for their child.