Stress Granule
Stress granules are dense aggregations in the cytosol composed of proteins & RNAs that appear when the cell is under stress. The RNA molecules stored are stalled translation pre-initiation complexes - failed attempts to make protein from mRNA. Stress granules are 100-200 nm in size, not surrounded by membrane, and associated with the endoplasmatic reticulum. Note that there are also nuclear stress granules. This article is about the cytosolic variety.
Read more about Stress Granule: Proposed Functions, Formation of Stress Granules, Connection With Processing Bodies
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