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Although it is unclear whether the serine residue in this motif is phosphorylated, K795 and K898 from the conserved basic patch are required for binding 17 , which indicates that phosphoserine binding may play a role in the interaction

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Nonetheless, there is yet solid evidence that validates the substantial expression of OCTN1 in the blood-brain barrier (BBB)

doi: 10.1038/s41423-025-01261-2 310 QuanJXieDLiZYuXLiangZChenYet al

The small tetrapeptide structure is relatively robust against aggregation