Additional file 1: Figure S1. Thermographs corresponding to the different buffer conditions shown in Table 1. Figure S2.AtGALS1 expressed in Nicotiana benthamiana has no detectable binding of UDP-Araf. Figure S3.Sobic_004G134100 AtGALS1 has no detectable binding of UDP-Arap or UDP-Xyl. Figure S4.AtGALS1 has very weak interaction with UDP-GlcA at physiologically irrelevant concentrations.