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The central stem of EBER1 coaxially stacks with stem loop 4 and stem loop 1 to form an extended RNA duplex of ∼32 bp that binds PKR and promotes activation. Our observations that EBER1 binds PKR much more weakly than VAI and exhibits weak PKR activation suggest that EBER1 is less well suited to function as an RNA decoy.ENL is a transcriptional coactivator that recruits elongation machinery to active cis-regulatory elements upon binding of its YEATS domain-a chromatin reader module-to acylated lysine side chains. Discovery chemistry for