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On the basis of previous findings that N-acetyl nonapeptide from the human calpain I large subunit has chemotactic activity for neutrophils, a series of peptides with the N-terminal sequence of the calpain small subunit were synthesized and their chemotactic activity was examined. Potent activity was found in N-acetyl tetra, hepta, octa, nona and a larger peptide of 13 residues, although N-acetyl tripeptide showed only weak activity and N-acetyl penta and hexa peptides showed almost no activity. Since the small subunit is identical in calpains I and II, the results indicate that both calpains could be precursor proteins of chemotactic factors for neutrophils.
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