NCAM1 and Wilms tumor: In this regard, FL clones may inform on the clonal in vivo regenerative response; As such it is noteworthy to mention NCAM1 (CD56), previously indicated as a marker activated in a subset of cultured human adult kidney tubular cells with clonogenic properties and in Wilms’ tumor stem cells 34–36 and here indeed shown to be a molecular marker of proximal clonal proliferation alongside HAVCR1/KIM1.