Table 4. Pigmentary abnormalities in WS2 probands with SOX10 and MITF mutations.

Phenotypes	Numbers (%) of WS2 probands		P-values
	with SOX10 mutations	with MITF mutations
Heterochromic iridis	13 (100)	7 (70)	0.068
Premature graying of the hair	1 (8)	4 (40)	0.127
Patchy de-pigmentation of the skin	3 (23)	1 (10)	0.604
Excessive freckles	0 (0)	7 (70)	4.9×104
Total	13 (100)	10 (100)	—