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. 2016 Aug 1;138(35):11073–11076. doi: 10.1021/jacs.6b04465

Figure 1.

Figure 1

Beads can be synthesized having a unique barcode, and then a 1:1 mixture of 3′-DMT and 3′-Lev phosphoramidites are added to enable stepwise synthesis of two different oligonucleotides on each bead.