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A study of a simple marine animal suggests that the common ancestor of cnidarians and bilaterians may have had three germ layers instead of two.

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image: Image of the Day: Eye of Pig

Image of the Day: Eye of Pig

By | September 6, 2017

This 10-centimeter-wide pig eye replica includes even the most intricate of blood vessels, some no wider than 30 micrometers.

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image: What the Sun Does to Photoreceptors

What the Sun Does to Photoreceptors

By | August 16, 2017

Optometrist and eclipse-chaser Ralph Chou describes how even a partially eclipsed sun can damage the eye.

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image: Image of the Day: The Tentacles Have Eyes

Image of the Day: The Tentacles Have Eyes

By | August 4, 2017

The tentacles that arise from these feathery fan worms’ heads are equipped with eyeballs capable of sensing shadows and movement.  

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Research shows that human immunity develops much earlier than previously thought, but functions differently in adults.

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The 19th century biologist’s drawings, tainted by scandal, helped bolster, then later dismiss, his biogenetic law.

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Time-lapse imaging shows the immune cells transferring chemical signals during pigment pattern formation in developing zebrafish.

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image: Infographic: How the Zebrafish Got Its Stripes

Infographic: How the Zebrafish Got Its Stripes

By | May 1, 2017

Immune cells called macrophages shuttle cellular messages in the skin.

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The lungs of extremely premature lambs supported in a closed, sterile environment that enables fluid-based gas exchange grow and develop normally, researchers report.

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image: Image of the Day: Stop Signals

Image of the Day: Stop Signals

By | April 17, 2017

Transcytosis, suppression of vesicle traffic across cells, helps reduce permeability in the blood-retinal barrier during development.

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