901204 ECx entorhinal cortex 8 901213 ECx eco-toxicity threshold 2 901208 ECx Ecological toxicity 1 901211 ECx effect concentration, x 1 901207 ECx Effect of soil leaching on the toxicity thresholds 1 901212 ECx effective concentrations causing x% inhibition 1 901210 ECx exposure concentrations 1 901209 ECx extended cholecystectomy 1