Your skin barrier comprises four layers that work together: the physical, chemical, microbiome, and immunological layers.

The trade-off of this hardy external layer is that it doesn't expand; it remains relatively inflexible and constricts the ...

Growing cells in the laboratory is an art that humans have mastered decades ago. Recreating entire three-dimensional tissues is much more challenging.

Karl Koehler builds inner ear and skin organoids from human stem cells to model their development in health and disease.