To confirm the capability of the PCNA antibody to generate foci-like signals, either in S phase or as a sign of DNA repair, human LN229 cell line-derived brain glioblastoma cells xenografted into NOD.CB17-Prkdcscid/NCrHsd mice were stained with an identical antibody directed against PCNA (Fig 3F and 3F’). Here, PCNA is linked to brain glioblastoma.