At 6 weeks after glioma injection, lysates from the contralateral cortex had endogenous PTPRZ signal detected using antiphosphacan and anti-PTPRZ (Santa Cruz), whereas lysates from the ipsilateral cortex had strong signal using anti-PTPRZ (Santa Cruz) and Cat-315; these findings indicate that the HNK-1 epitope was expressed in transplanted LN-229 cells. Here, PTPRZ1 is linked to glioma.