A complex comprising at least one heat shock protein (HSP) and at least one peptide selected from the group consisting of R.sub.1-QXRAA-R.sub.2 with R.sub.1=peptide with 1-10 amino acids R.sub.2=peptide with 1-10 amino acids X=K or R GFFYTPK (insulin 23-29) SEQ ID No 1 GFFYTPKT (insulin 23-30) SEQ ID No 2 IYPPNANK (DER p1) SEQ ID No 3 GIEYIQHNGVVQESYYR (DER P1) SEQ ID No 4 ASTTTNYT (gp120 of HIV) SEQ ID No 5 DYEYLINVIHAFQYV (PLP 56-70) SEQ ID No 6 EKLIETYFSKNYQDYEYLINVI (PLP 43-64) SEQ ID No 7 KTTICGKGLSATVT (PLP 104-117) SEQ ID No 8 HSLGKWLGHPDKF (PLP 139-151 C140 o S140) SEQ ID No 9 PRHPIRVELPCRISP (MOG 8-22) SEQ ID No 10 DEGGYTCFFRDHSYQ (MOG 92-106) SEQ ID No 11 Ac-ASQKRPSQRHG (MBP ac1-11) SEQ ID No 12 TGILDSIGRFFSG (MBP 35-47) SEQ ID No 13 VHFFKNIVTPRTP (MBP 89-101) SEQ ID No 14 HCLGKWLGHPDKF (PLP 139-151) SEQ ID No 15 MEVGWYRSPFSRVVHLYRNGK (MOG) SEQ ID No 16 QKRAAYDQYGHAAFE (E. Coli DnaJ) SEQ ID No. 17 QKRAAVDTYCRHNYG (HLA DRB1*0401) SEQ ID No. 18 QRRAAYDQYGHAAFE SEQ ID No. 19 and QRRAAVDTYCRHNYG SEQ ID No. 20.