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Fig. 4. Large CPEB1 granules are stress granules. HeLa cells were transiently transfected with an expression vector for GFP-tagged human CPEB1-{Delta}5-long. After 24 hours, cells were directly fixed (A) or stressed with arsenite for 30 minutes and fixed (B), then stained with anti-eIF3 antibodies (red) and observed by fluorescence microscopy.