An isolated fibrin-binding peptide or a modification thereof comprising an amino acid sequence selected from the group consisting of: • WQP C *PAESWTF C *WDP • WQP C *PAESWTF C *WDPGGGK • WQP C *PAESWTF C *WDPGSAGSK • WQP C *PAESWTF C *WDPGAGSGK • GPPGWQP C *PWESWTF C *WDP • GPPGWQP C *PWESWTF C *WDPGGGK • GGRGWQP C *PWESWTF C *WDP • GGRGWQP C *PWESWTF C *WDPGGGK • GWQP C *PWESWTF C *WDP • GWQP C *PWESWTF C *WDPGGGK • SGSG J WQP C *PWESWTF C *WDP • SGSG J WQP C *PWESWTF C *WDPGGGK • WQP C *PWESWT-Cha- C *WDP • WQP C *PWESWT-Cha- C* WDPGGGK • WQP C *PWESWT-Ffe4- C *WDP • WQP C *PWESWT-Ffe4- C *WDPGGGK • WQP C *PWESWT-F34fe- C *WDP • WQP C *PWESWT-F34fe- C *WDPGGGK • RGWQP C *PWESWTF C *WDP • RGWQP C *PWESWTF C *WDPGGGK • RWQP C *PWESWTF C *WDP • RWQP C *PWESWTF C *WDPGGGK • SGSGSGSGWQP C *PWESWTF C *WDP • SGSGSGSGWQP C* PWESWTFC*WDPGGGK • KKGWQP C* PWESWTF C* WDP • KKGWQP C* PWESWTF C* WDPGGGK • KGKGKGWQP C* PWESWTF C* WDP • KGKGKGWQP C* PWESWTF C* WDPGGGK • S(Galnac)WQP C* PWESWTF C* WDP • S(Galnac)WQP C* PWESWTF C* WDPGGGK • Thf2ca-WQP C* PWESWTF C* WDP • Thf2ca-WQP C* PWESWTF C* WDPGGGK • RRGGWQP C* PWESWTF C* WDP • RRGGWQP C* PWESWTF C* WDPGGGK • WQP C* -Hypt4-WESWTF C* WDP • WQP C* -Hypt4-WESWTF C* WDPGGGK • GPPGWQP C* PAESWTF C* WDP • GPPGWQP C* PAESWTF C* WDPGGGK • GWQP C* PAESWTF C* WDP • GWQP C* PAESWTF C* WDPGGGK • GWQP C* PAESWTF C* WDP • GWQP C* PAESWTF C* WDPGGGK • WQP C* PAESWT-Cha- C* WDP • WQP C* PAESWT-Cha- C* WDPGGGK • RRGGWQP C* PAESWTF C* WDP • RRGGWQP C* PAESWTF C* WDPGGGK • RRGGWQP C* -Hypt4-WESWTF C* WDP • RRGGWQP C* -Hypt4-WESWTF C* WDPGGGK • RWQP C* PWESWTF C* WDP • RWQP C* PWESWTF C* WDPGGGK • RWQP C* PAESWT-Cha- C* WDP • RWQP C* PAESWT-Cha- C* WDPGGGK • GWQP C* PAESWT-Cha- C* WDP • GWQP C* PAESWT-Cha- C* WDPGGGK • RGWQP C* PAESWT-Cha- C* WDP • RGWQP C* PAESWT-Cha- C* WDPGGGK • GWQP C* PAESWT-Cha- C* WDP • GWQP C* PAESWT-Cha- C* WDPGGGK • RWQP C* PAESWTF C* WDP • RWQP C* PAESWTF C* WDPGGGK • RWQP C* PAESWT-Cha- C* WDP • RWQP C* PAESWT-Cha- C* WDPGGGK wherein: - C* denotes a cysteine contributing to a disulfide bond, - J denotes Fmoc-8-amino-3,6-dioxaoctanoic acid, - Cha denotes 2-Cyclohexyl-L-alanine, - Ffe4 denotes L-4-Fluorophenylalanine, - F34fe denotes L-3,4-difluorophenylalanine, - Thf2ca denotes Tetrahydrofuran-2-carboxylic acid, - Hypt4 denotes trans-4-hydroxy-L-proline, and - S(Galnac) denotes O-(2-acetamido-2-deoxy-or-D-galactopyranosyl)-L-Serine • WQP C *PAESWTF C *WDP • WQP C *PAESWTF C *WDPGGGK • WQP C *PAESWTF C *WDPGSAGSK • WQP C *PAESWTF C *WDPGAGSGK • GPPGWQP C *PWESWTF C *WDP • GPPGWQP C *PWESWTF C *WDPGGGK • GGRGWQP C *PWESWTF C *WDP • GGRGWQP C *PWESWTF C *WDPGGGK • GWQP C *PWESWTF C *WDP • GWQP C *PWESWTF C *WDPGGGK • SGSG J WQP C *PWESWTF C *WDP • SGSG J WQP C *PWESWTF C *WDPGGGK • WQP C *PWESWT-Cha- C *WDP • WQP C *PWESWT-Cha- C* WDPGGGK • WQP C *PWESWT-Ffe4- C *WDP • WQP C *PWESWT-Ffe4- C *WDPGGGK • WQP C *PWESWT-F34fe- C *WDP • WQP C *PWESWT-F34fe- C *WDPGGGK • RGWQP C *PWESWTF C *WDP • RGWQP C *PWESWTF C *WDPGGGK • RWQP C *PWESWTF C *WDP • RWQP C *PWESWTF C *WDPGGGK • SGSGSGSGWQP C *PWESWTF C *WDP • SGSGSGSGWQP C* PWESWTFC*WDPGGGK • KKGWQP C* PWESWTF C* WDP • KKGWQP C* PWESWTF C* WDPGGGK • KGKGKGWQP C* PWESWTF C* WDP • KGKGKGWQP C* PWESWTF C* WDPGGGK • S(Galnac)WQP C* PWESWTF C* WDP • S(Galnac)WQP C* PWESWTF C* WDPGGGK • Thf2ca-WQP C* PWESWTF C* WDP • Thf2ca-WQP C* PWESWTF C* WDPGGGK • RRGGWQP C* PWESWTF C* WDP • RRGGWQP C* PWESWTF C* WDPGGGK • WQP C* -Hypt4-WESWTF C* WDP • WQP C* -Hypt4-WESWTF C* WDPGGGK • GPPGWQP C* PAESWTF C* WDP • GPPGWQP C* PAESWTF C* WDPGGGK • GWQP C* PAESWTF C* WDP • GWQP C* PAESWTF C* WDPGGGK • GWQP C* PAESWTF C* WDP • GWQP C* PAESWTF C* WDPGGGK • WQP C* PAESWT-Cha- C* WDP • WQP C* PAESWT-Cha- C* WDPGGGK • RRGGWQP C* PAESWTF C* WDP • RRGGWQP C* PAESWTF C* WDPGGGK • RRGGWQP C* -Hypt4-WESWTF C* WDP • RRGGWQP C* -Hypt4-WESWTF C* WDPGGGK • RWQP C* PWESWTF C* WDP • RWQP C* PWESWTF C* WDPGGGK • RWQP C* PAESWT-Cha- C* WDP • RWQP C* PAESWT-Cha- C* WDPGGGK • GWQP C* PAESWT-Cha- C* WDP • GWQP C* PAESWT-Cha- C* WDPGGGK • RGWQP C* PAESWT-Cha- C* WDP • RGWQP C* PAESWT-Cha- C* WDPGGGK • GWQP C* PAESWT-Cha- C* WDP • GWQP C* PAESWT-Cha- C* WDPGGGK • RWQP C* PAESWTF C* WDP • RWQP C* PAESWTF C* WDPGGGK • RWQP C* PAESWT-Cha- C* WDP • RWQP C* PAESWT-Cha- C* WDPGGGK - C* denotes a cysteine contributing to a disulfide bond, - J denotes Fmoc-8-amino-3,6-dioxaoctanoic acid, - Cha denotes 2-Cyclohexyl-L-alanine, - Ffe4 denotes L-4-Fluorophenylalanine, - F34fe denotes L-3,4-difluorophenylalanine, - Thf2ca denotes Tetrahydrofuran-2-carboxylic acid, - Hypt4 denotes trans-4-hydroxy-L-proline, and - S(Galnac) denotes O-(2-acetamido-2-deoxy-or-D-galactopyranosyl)-L-Serine