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Dose–response curve of the number of fronds of Lemna minor and the concentrations of (a) D-glucosamine hydrochloride (G), (b) N-acetyl-D-glucosamine (NAG), (c) chitobiose dihydrochloride (2G) and (d) N-carboxymethyl chitosan (N-CMChi). Symbols with same letter do not present statistically significant differences (Supplementary Tables S1–S3).
