Figure 4.

Blocking LTP induction does not prevent the labeling of cell bodies and primary dendritic branches. The rhodamine-phalloidin-labeled cell to the left (A) is from a slice that had been infused with the NMDA receptor antagonist APV from 15 min before the delivery of theta bursts to its Schaffer-commissural afferents, whereas the labeled cell on the right (B) was clamped at -80 mV during the theta burst train. There was no evidence of increased spine staining in these cases, although, as shown, labeling of the cell bodies and primary dendritic branches was robust. so, Stratum oriens; sr, stratum radiatum. Magnification, 10×.