differential ammonium sulfate precipitation of the supernatant ribosome-associated proteins from virus-infected and mock-infected cells indicated by reciprocal reconstitution studies that the defective ribosomal initiation factor ( s ) was ( were ) present primarily in the 0-40 % ammonium sulfate fraction that is considered to contain primarily eif-3 and eif-4b .
C0035553
ribosome
C0007634
cells