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Because the same gene can be transcribed or silenced depending on where in the nucleus it sits

They remain a major focus in orthopedic surgery and fracture prevention research

The fact that trilobites could see underwater at all was a landmark evolutionary achievement

trilobite necklace | gold vermeil gold_plated researchers in retinal degenerationtrilobite necklace 18k gold vermeil A trilobite necklace for paleontologists, fossil collectors, and anyone who has held a 500 million year old animal in the palm of their hand. One of the most successful body plans in evolutionary history, in 18k gold vermeil. The Story Behind the Trilobite Trilobites appeared in the early Cambrian around 521 million years ago and persisted for nearly 270 million years before going extinct in the end Permian mass