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Harvesting lab-raised zebrafish based on their size led to differences in the activity of more than 4,000 genes, as well as changes in allele frequencies of those genes, in the fish that remained.

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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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From fish harvests to cottonwood forests, organisms display evidence that species change can occur on timescales that can influence ecological processes.

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image: Another New Timeline for <em>Homo naledi</em>

Another New Timeline for Homo naledi

By | April 27, 2017

The ancient human may have lived around 200,000 to 300,000 years ago—much more recently than previously estimated.

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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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image: Study: Diet Contributes to Brain Size

Study: Diet Contributes to Brain Size

By | March 30, 2017

The results of a historical primate behavior analysis suggest that species with fruit-filled diets evolved larger brains.

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image: In Certain Social Bees, Gut Microbiomes Follow Phylogeny

In Certain Social Bees, Gut Microbiomes Follow Phylogeny

By | March 29, 2017

Corbiculate bees and their gut-dwelling microbes have been coevolving since the social species evolved from their solitary ancestors around 80 million years ago, scientists suggest. 

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