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Linkage on chromosome 1 for Quantity × Frequency with full and truncated samples (100%, 90%, 80%, 60%), using the younger dataset, and showing the location of candidate genes STX12 (syntaxin 12-binding protein), OPRD1 (opioid receptor, delta-1), DHX9 (DEAH (Asp-Glu-Ala_His) box Polypeptide 9), and AGT (angiotensinogen).
