Ethosuximide treatment of the 5 new SWD-positive inbred strains. The symbols represent each SWD episode for the 2 hours before and after injection of ethosuximide (Etx) or saline. For C57BLKS/J, DBA/1J, CBA/J and NOR/LtJ, mouse 1 was treated with Etx, and a saline control. For SM/J, all 3 mice were treated with both Etx and saline.