... system by blocking the passage of chloride ions through the GABA receptor and glutamate-gated chloride (GluCl) channels, components of the ... fipronil on insects may come from a better efficacy on GABA receptor, but also because GluCl channels do not exist in ... a insecticide which acts as a potent blocker of the GABA-regulated chloride channel. Insects resistant or tolerant to pyrethroid, cyclodiene ...