question: Which mRNAs are sequestered in stress granules?
answer: Stress granules are higher order assemblies of nontranslating mRNAs and proteins that form when translation initiation is inhibited. 
  This subset of mRNAs is characterized by extended length and adenylate-uridylate (AU)-rich motifs, is highly enriched with genes critical for cell survival and proliferation. mRNA accumulation in stress granules correlates with longer coding and UTR regions and poor translatability