Eight cases have mutation from adenine (A) to cytosine (C) in 546th nucleotide and from asparagine (N) to threonine (T) in 131st amino acid residue.

• 8份序列均存在第546位核营酸从A到C的突变，使第131位氨基酸由天冬氨酞(N)变为苏氨酸(T)。