Table 2.

Common Type B NPD Mutations in Specific Ethnic Groups

Ethnic Group (No. ofNPD Alleles Studied)and Mutation	AlleleFrequency(%)
Turkish (20):
L137P	37
L549P	20
fsP189	16.6
Saudi Arabian (28):
H421Y	71.4
K576N	13.2
Scottish/British (30):
A196P	42.3
Brazilian/Portuguese (24):
ΔR608	20.8
S379P	16.6
R441X	12.5
R474W	12.5
F480L	12.5
Other (222):
ΔR608	20