abstract |
A peptide characteristic of an epitope of a Crohn's disease antibody, which is represented by the following sections (a) or (b): (a) a peptide comprising an amino acid sequence represented by SEQ ID NO: 3, or a salt thereof; and (b) a peptide comprising a modified amino acid sequence of SEQ ID NO: 3, in which one or some of the amino acids are substituted, deleted or added, or part of the modified or unmodified amino acid sequence of SEQ ID NO: 3, and which has the property of binding to a Crohn's disease antibody that binds to the above peptide (a), or a salt thereof. |