Faces of individuals with a 17q21.31 deletion. Facial photographs of case 1, at age 10 months; case 2, at age 1 year; case 3, at age 2 years; case 4, at age 3 years; case 5, at age 3 years; case 6, at age 3 years 5 months; case 7, at age 3 years 8 months; case 8, at age 3 years; case 9, at age 5 years 8 months; case 10 at age 5 years; case 11, at age 3 years 9 months; case 12, at age 8 years 6 months; case 14, at age 13 years; case 15, at age 14 years; case 16, at 14 years; case 18, at 16 years; case 19, at 13 years; case 20, at age 18 years; case 21, at 17 years and case 22, at age 26 years.