Description_x000D_ Amino Acid Sequence_x000D_ Acetyl-Asp-Phe-Glu-Glu-Ile-Pro-Glu-Glu-Tyr-Leu-Gln_x000D_ Application_x000D_ Ac-Hirudin Fragment 55-65 non-sulfated is a C-terminal fragment (fibrinogen-recognition site binding) of the leech anticoagulant peptide hirudin. Ac-Hirudin Fragment 55-65 may be used with other C-terminal fragments to study optimal N-terminal and position 56 functionalities for C-terminal fragment analogues of hirudin.