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Genes & Cells

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a baby breast feeding

GOOD NUTRITION  Breast milk contributes to an intestinal mix of microbes in newborns that might suppress pet allergy risk later, a study finds.

Pseudomonas fluorescens

Two mutations allowed soil bacteria (Pseudomonas fluorescens) to re-evolve flagella: One pumped up levels of a protein than controls nitrogen uptake, and one that switched that protein’s job to flagella production control.

Big Brain

FOLD IT  A gene that only humans have can make the normally smooth outer layer of mouse brains develop folds similar to those in human brains (upper right center). The gene may have been important for the evolution of big human brains.

Genes & Cells

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