Correct citation: Olczak M, Duszczyk M, Mierzejewski P, Bobrowicz T, Majewska MD. Neonatal administration of thimerosal causes persistent changes in mu opioid receptors in the rat brain. Neurochem Res. 2010 Nov;35(11):1840-7. doi: 10.1007/s11064-010-0250-z. Epub 2010 Aug 28.
Rat study, thimerosal (no longer used in U.S. childhood vaccines except for some influenza vaccines), concentrations higher than formerly found in vaccines.
Note: lead researcher M Dorota Majewska seems to have specialized in rat studies that show thimerosal damage.