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The percent phosphate (Pi) cleaved from various R5P/amine systems at pH 8 and 37 °C as determined by 31P NMR. The R5P concentration was 0.05 M, and the amine concentration was 0.10 M except for poly(lysine) where the amine concentration (of the R groups) was 0.050 M. Symbols: Poly(lysine) (+); Asn (◊); β-Ala (■); l-NAcLys (△); l-Ala (◆); Gly-gly (▲); Gly (□).
