1. A composition comprising at least one peptide or polypeptide comprising an amino acid posledovatelnostgde X b is any amino acid residue Hpredstavlyaet an amino acid residue selected from the group consisting of lysine (K), arginine (R), alanine (A) and histidine (H) Hpredstavlyaet an amino acid residue selected from the group consisting of asparagine (N), glutamine (Q), serine (S), glycine (G) and alanine (A), preferably from asparagine (N), serine ( S), glycine (G) and alanine (A), an amino acid Hpredstavlyaet Remainder approx selected from the group consisting of glutamic acid (E), aspartic acid (D) and alanine (A), X b is an amino acid residue selected from the group consisting of glutamic acid (E) and aspartic acid (D), Hpredstavlyaet a amino acid residue selected from the group consisting of alanine (A) and tyrosine (Y), Hpredstavlyaet any amino acid residue, n and m, independently, is 0 or an integer greater than 0, and wherein the amino acid sequence according to formula I is not comprises identical or 7-me molecular weight polypeptide fragment of alpha-synuclein having the amino acid sequence KNEEGAP, wherein at least one said peptide or polypeptide has a binding capacity to an antibody which is specific to an epitope of alpha-synuclein comprising the amino acid sequence KNEEGAPdlya use in the prophylaxis and / or treatment synucleinopathies. 2. The composition of claim 1 wherein Hpredstavlyaet an amino acid residue selected from the group consisting of lysine (K) and arginine (R), and / or a Hpredstavlyaet Alapini (A) .3. The composition of
