The 2024 fusion-peptide work exists precisely because researchers recognized that native DSIPs delivery to the brain is the bottleneck, and engineered around it by fusing DSIP to a blood-brain-barrier-crossing TAT transduction domain (sequence GGGGYGRKKRRQRRR) via flexible GGGGS linkers, expressed and secreted from Pichia pastoris
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The problem is that glutathione levels drop naturally with age, stress, and sun exposure
This way, whenever a dose is extracted from the vial, the stopper will not self-seal effectively, leading to an increased risk of contamination due to environmental influence
Many patients choose to learn self-administration techniques after initial training, allowing for convenient at-home treatment
S2CID 7282489