What mechanism results in the malformation of cleft lip?

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Cleft lip/palate is caused by the failure of the lip and/or palate tissues to fuse during development. This mechanism is considered a malformation because it is due to a developmental problem during facial formation. The tissues making up the lip do not fuse properly, leaving a gap (or cleft). Although a cleft lip, with or without cleft palate, is usually caused by a combination of genetic and environmental factors, it is the result of an abnormal developmental process.

What Mechanism Results in the Malformation of Cleft Lip