using an assay system which requires all the initiation factors for optimal activity it was possible to show that the 0-40 % ammonium sulfate cut of initiation factors ( containing eif-3 and eif-4b ) was sensitive to helenalin , while the 40-50 % ammonium sulfate cut ( containing eif-2 and eif-5 ) was not .
C0030943
initiation factors
C0752615
eif-3