"Knowledge of the toxicokinetics and developmental toxicity of thimerosal is needed to afford a meaningful assessment of the developmental effects of thimerosal-containing vaccines."

And we know all that, which is how we know that Thimerosal doesn't share the same toxicological effects as elemental Mercury, and how ethyl-mercury and methyl-mercury are stored and excreted differently, and thus have VERY different toxicological effects.