The present invention relates to a pharmaceutical composition comprising as active substance, at least one compound comprising, or consisting of, a polypeptide which comprises, or consists of, at least 11 contiguous amino acids selected from X1-S-D-I-F-X2-G-E-P-X3-L-X4-P-X5-X6-X7-X8-X9-Q-L (SEQ ID NO: 13).