Have thin slices of mouse, rat, cat, or guinea pig been imaged under electron microscope of those animals that have been raised in an Hg (vapor) saturated environment? If so, have the brain slices been stained with a fluorescent dye? Or, alternatively, have pictures of thin slices of such brains just been taken under a UV light? Would be interested to know. {I expect such thin slices would fluoresce purple / pink.} Could be wrong. Just a 'working hypothesis.'