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Cells are the smallest building blocks of living organisms. Just like a city, each cell contains many specialized parts that work together. One of these parts is the endoplasmic reticulum. Although its name may seem long and complex, you’ll find it fascinating once you learn what it does! What Is the Endoplasmic Reticulum? The endoplasmic reticulum (abbreviated as ER) is a folded, tubular structure inside the cell. It functions like a factory and is located very close to the cell nucleus, with w