LAMB3 and junctional epidermolysis bullosa: Biallelic mutations in LAMA3, LAMB3, and LAMC2 cause junctional epidermolysis bullosa with severe enamel hypoplasia in humans [18,19,20,21], while single allelic defects in LAMA3 [22,23,24] and LAMB3 [25,26,27,28,29] cause localized enamel defects without skin fragility.