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It was hypothesized that such expansion might have occurred during adaptation to environmental selection pressure

And it allows for several different things

1821 As has been discussed, glutathione is rapidly absorbed by the orobuccal route and reaches high enough levels in the blood to be therapeutically efficacious

Evidence that DDT-dehydrochlorinase from the house fly is a glutathione S-transferase

Training and Guidance: The Company offers all-around training and ongoing support for its franchisee to equip them with all the knowledge and skills required to run the business successfully

It has been studied in both the TACT and TACT II Trials of the NIH