Diagnostic drug and diagnostic method for Alzheimer's disease

An antibody recognizing a S38AA polypeptide, wherein the S38AA polypeptide consists of the amino acid sequence of SEQ ID NO:

• 1, or an amino acid sequence resulting from substitution, deletion, addition, or insertion of one to several amino acids in the amino acid sequence of SEQ ID NO:
• 1, and wherein the antibody is
• (a) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 4, and the light chain variable region of SEQ ID NO:
• 5,
• (b) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 6, and the light chain variable region of SEQ ID NO:
• 7,
• (c) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 8, and the light chain variable region of SEQ ID NO:
• 9,
• (d) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 10, and the light chain variable region of SEQ ID NO:
• 11,
• (e) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 12, and the light chain variable region of SEQ ID NO:
• 13,
• (f) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 14, and the light chain variable region of SEQ ID NO:
• 15,
• (g) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 16, and the light chain variable region of SEQ ID NO:
• 17,
• (h) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 18, and the light chain variable region of SEQ ID NO:
• 19,
• (i) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 20, and the light chain variable region of SEQ ID NO:
• 21, or
• (j) an antibody comprising the heavy chain variable region of SEQ ID NO:
• 22, and the light chain variable region of SEQ ID NO:
• 23.