MSX2 and Neurodevelopmental delay: We further sequenced MSX2 in the additional set of 463 independent cases of NDD (Tables S2 and S3), and found three missense variants c.74G>T, c.175C>T, and c.694G >A (p.Gly25Val, p.Pro59Ser, and p.Ala232Thr, respectively) in three patients (Table S8).