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Cranial circumference and allelic status at SNPs (A, C) HOXB1 rs72338773 [c.82insACAGCGCCC (INS/nINS)], (B, D) HOXB1 rs12939811 [c.309A>T (Q103H)], (E) HOXA1 rs10951154 [c.218A>G (H73R)], and (F) HOXA1 × HOXB1 interactions at SNPs c.218A>G and c.309A>T, respectively. Sample sizes are reported for each group below the X-axis. Data are expressed as median+interquartilic range (▲ = median; T = I.Q.R.; ▯= non-outliers).
