Building functional human muscle in the laboratory has long been a goal of regenerative medicine, but one stubborn obstacle remains: real muscle is not just a mass of cells. Its strength and function ...

Building functional human muscle in the laboratory has long been a goal of regenerative medicine, but one stubborn obstacle ...

The heart (cyan) forms from two distant regions of the embryo (far left). These regions migrate to the embryo midline, where they fuse into a tube to make the first heart structure (far right).

In developing hearts, cells shuffle around, bumping into each other to find their place, and the stakes are high: pairing ...