β-Amyloid (1-9), an N-terminal fragment of beta amyloid, consists of amino acid residues 1 to 9. β-Amyloid (1-9) contains a B cell epitope, but it does not include T cell epitopes. Omission of residues 1 to 9 from the full-length Alzheimer'sβ-Amyloid peptide 1 to 40 does not prevent the peptide from forming amyloid fibrils or eliminate fibril polymorphism [1][2].
[1]. Zamora E, et al. Papillomavirus-like particles are an effective platform for amyloid-beta immunization in rabbitsand transgenic mice. J Immunol. 2006 Aug 15;177(4):2662-2670. [2]. Paravastu AK, et al. Polymorphic fibril formation by residues 10-40 of the Alzheimer's beta-amyloid peptide. Biophys J. 2006 Jun 15;90(12):4618-29.