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(A) One-picoliter droplets can be dispensed, moved, merged, mixed, and split in an open geometry using electric fields. (B) Droplet libraries can be challenged against a reactant and then sorted at ultrahigh throughput in channels. From Wheeler (2008). Reprinted with permission from AAAS. Reproduced from Guo et al. (2012) with permission of The Royal Society of Chemistry.
