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Increased expression of CD133 (Prominin-1), an important cancer stem cell-associated marker, has been observed in the cancer stem cells of a variety of human and mouse cancers. However, no natural ligand of CD133 has yet been identified and little is known about its function. In the present study, LS-7 (amino acid sequence: LQNAPRS), a specific binding peptide targeting mouse CD133, was screened and...