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Category of HPLC-MS-identified glycylglycerins. In human iPSCs, the glycylation of glycerin forms three different kinds of glycylglycerins, including monoglycylglycerins (MGG), diglycylglycerins (DGG) and triglycylglycerin (TGG). All these glycylglycerins carry positive charges in their amino groups at ≤pH 7.0 and can form isoforms as shown in the right bottom corner box.
