Using adaptive optics, scientists have identified elusive retinal ganglion cells in the eye's fovea that could explain how humans see red, green, blue, and yellow. Scientists have long wondered how ...

Due to their simple body structure with a limited number of cell types, freshwater polyps (Hydra) can be used to study many fundamental processes of life. In recent years, Hydra has also experienced a ...

Certain stem cells have a unique ability to move between growth compartments in hair follicles, but get stuck as people age and so lose their ability to mature and maintain hair color, a new study ...