only marginally significantP < 0.05
However, with the application of 5 μM U0126 from 60 minutes onwards, the maintenance of potentiation was affected; the potentiation was only marginally significant by 120 minutes ( P < 0.05) and gradually decayed back to baseline becoming not significantly different from the baseline 145 minutes onwards ( P > 0.05, Fig. 4 a, n = 7).