EEF1A1 and Parkinson disease: To further determine the effect of 6-OHDA exposure on the expression of eEF1A isoforms in the C. elegans PD model, we investigated the mRNA expression changes of eft-3 and eft-4 (homolog of mammalian EEF1A1 and EEF1A2, respectively) after exposure to 50 mM 6-OHDA.