(c) Mean latency
to development of epileptiform activity comparing neurons from sham mice, to peritumoral neurons in animals implanted with U251-GFP, GBM12 and GBM22 tumors (*P < 0.05). (d) Mean event duration recorded in sham, U251, GBM12 and GBM22-containing brain slices. Error bars represent means ± s.e.m.