A CD47 partial peptide which has an amino acid sequence constituting an
extracellular region having an immunoglobulin-like structure of a CD47
protein, which is specifically bound to an N-terminal immunoglobulin-like
structure of a dephosphorylation substrate protein SHPS-1 of an SH2
domain-containing protein, and which can act on a function of cell
response mediated by SHPS-1, and an anti-SHPS-1 monoclonal antibody.