Proc Natl Acad Sci U S A. 2003 Jun 10;100(12):7033-8 doi:10.1073/pnas.1232347100

Choi YH, Hagedorn CH.

Purifying mRNAs with a high-affinity eIF4E mutant identifies the short 3' poly(A) end phenotype.

Increases cap specificity with a K119A mutation. This mutant is fused to GST instead of protein A.