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The flow of calcium and potassium ions keeps muscles contracting in the diaphragms of neonatal mice, but if a key protein receptor is missing, fatigue sets in more quickly.

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image: Distinct Regions Drive Responses to Anxiety, Fear

Distinct Regions Drive Responses to Anxiety, Fear

By Catherine Offord | January 1, 2018

Researchers map brain activity associated with a person’s anticipation of or direct confrontation with danger.

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image: Microglia Turnover in the Human Brain

Microglia Turnover in the Human Brain

By Shawna Williams | October 1, 2017

Researchers find that about a quarter of the immune cells are replaced every year.

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Pauses may help cells fine-tune gene expression.

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image: Researchers Identify Clue to Asymmetric Cell Division

Researchers Identify Clue to Asymmetric Cell Division

By Shawna Williams | September 1, 2017

Phosphorylation of a surface protein on endosomes is key to the organelles’ uneven distribution in daughter cells.

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Using single-cell RNA sequencing, scientists characterize new populations of dendritic cells and monocytes.

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The presence of similar light-emitting enzymes in the distantly related organisms lends new insight into bioluminescence evolution.

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image: Bone Marrow Isn’t the Only Source of Platelets

Bone Marrow Isn’t the Only Source of Platelets

By Ashley P. Taylor | June 1, 2017

Scientists have estimated that about half of murine platelet production occurs in the lungs.

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image: Genes’ Composition Guides More-Optimal Diets

Genes’ Composition Guides More-Optimal Diets

By Ruth Williams | June 1, 2017

Fruit flies and mice grow better and eat less when the amino acid balance of their food reflects that coded by their exomes.

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image: Long-Term Memory Storage Begins Immediately

Long-Term Memory Storage Begins Immediately

By Kerry Grens | June 1, 2017

In mice, cells in the prefrontal cortex—where memories are maintained long-term—start to encode a fearful experience right from the start.

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