Polypeptide with function of targeting recognition of immune cells and application thereof

A method for in vivo or in vitro imaging immune cells, comprising incubating an effective amount of a composition with cells or tissues to be labeled,

• wherein the composition comprises a polypeptide for targeting recognition of immune cells,
• wherein the polypeptide is selected from the group consisting of EQPDPGAVAAAAILRAILE (SEQ ID NO.:1), LEQPDPGAVAAAAILRAILE (SEQ ID NO.:2), EQPDPGAVAAAAILRAILEVLQS (SEQ ID NO.:3), KNMEAGAGRASYISSARLEQPDPGAVAAAAILRAIL (SEQ ID NO.:4), TKNMEAGAGRASYISSARLEQPDPGAVAAAAILRAILEVLQS (SEQ ID NO.:5), LQPDPGAVAAAAVLRAVLEGLQG (SEQ ID NO.:6), DQPDPGAVAAAAIFRAILEVLQTKAA (SEQ ID NO.:7), DQPDPGAVAAAAILRTILEVLQSQGV (SEQ ID NO.:8), DQPDPGAVAAAAILRAILEVLQSQGA (SEQ ID NO.:9) and EQPDPGAVAAAAILRAILEVLQS (SEQ ID NO.:10),
• wherein a X or Y is linked to the C-terminal and/or N-terminal of the polypeptide;
• and
• wherein the X or Y is a reporter, a cysteine amino acid linked reporter or a lysine amino acid linked reporter.