This week’s articles describe the signals mediating gut microbe activation of T cells, skin patterning in development, and photosynthesis.
IMMUNOLOGY
Bacteria-selective gut T cells
Cervantes-Barragan et al. show that Lactobacillus reuteri induces a specific type of gut intraepithelial T cell through tryptophan catabolites that activate aryl hydrocarbon receptors.
DEVELOPMENT
Mechanosensation directs skin development
Shyer et al. discover that mechanical force establishes the patterning of skin follicles in developing chicks.
STRUCTURAL BIOLOGY
Structure and assembly of a plant supercomplex
Su et al. report that structural differences in the photosynthetic machinery enable plants to optimize photosynthesis under different light conditions.