BCR and neoplasm: In particular, we identified peptide binders of the Ig-BCR idiotypic determinants (hereafter named “Id-peptides”) that are expressed on the surface of the A20 murine B-cell lymphoma, which revealed to be sensitive tools for in vivo tumor detection and tumor-specific delivery of radionuclides, fluorophores, siRNAs and nanoparticles [23].