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Molecular structures of the tetrapeptide derivatives/precursors with two or one phosphotyrosines (TPD-2p and TPD-1p) and their fluorescent analogs (fTPD-2p and fTPD-1p). These precursors turn into the self-assembling D-peptidic hydrogelators (i.e., TPD and fTPD) after enzymatic dephosphorylation by alkaline phosphatase (ALP).
