The search terms for mutations were as follows: Meier–Gorlin syndrome, ORC1, ORC4, ORC6, CDT1, CDC6, CDC45, GMNN, MCM3, MCM5, MCM7, GINS2, GINS3, DONSON, primordial dwarfism, or ear-patella-short stature syndrome. This evidence concerns the gene CDT1 and nevoid basal cell carcinoma syndrome.