The endoplasmic reticulum (ER) is a compartment (organelle) in eukaryotic cells that consists of membrane sacs called cisternae. Because of the bound ribosomes, the 'rough' ER is the site of synthesis ...
Travel through 4.6 billion years of our planet's history and help protect its future. Snap a selfie with a piece of Mars, touch a fragment of the Moon and lay your hands on a meteorite older than our ...
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