Adolescence marks not only the period of physical maturation bridging childhood and adulthood, but also a crucial period for remodeling of the human brain. A Penn study reveals new patterns of ...

KANSAS CITY, MO – For a tiny embryo to grow into an entire fruit fly, mouse or human, the correct genes in each cell must turn on and off in precisely the right sequence. This intricate molecular ...

Self-organizing multicellular systems derived from mouse embryonic stem (mES) cells called gastruloids, which previously have been shown to mimic critical events of mammalian gastrulation, have been ...

Patterns that guide the development of feathers and other features can be set by mechanical forces in the embryo, not just by gradients of chemicals. One of the longest-standing questions in biology ...