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Analysis of the usage of single PEGs in the four primary screens. (a) Lists of PEGs and their frequency of use in the benchmarking set of four widely used commercially relevant screens routinely employed during initial crystallization at the SGC. (b) Pie chart demonstrating the proportion of each PEG used in the total 218 PEG-based cocktails of the four commercially relevant primary screens, revealing a highly biased sampling towards some particular PEG variants.
