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You lose the benefit of the intact molecule
For periorbital testing, mice were placed in a paper cup to which they had previously been habituated, and then the periorbital region, positioned caudal to the eyes and near the midline, was stimulated with a von Frey filament
I think its much more plausible that its just preventing us from that tipping point
The l form is more widely occurring in nature, but the d form occurs in some special contexts, such as the bacterial capsule and cell walls of the bacteria (which produce it from the l form with the enzyme glutamate racemase) and the liver of mammals
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