A fluid-to-solid “jamming” transition, seen in…

A fluid-to-solid “jamming” transition, seen in materials like glass and foams, has been observed in the developing tissues of zebrafish embryos. Cells in the elongating tail (yellow) “melt apart” to become more pliable but stay packed like a solid further up the body to fix changes in place.

Credit: Brian Long, UC Santa Barbara College of Engineering

Via Quanta Magazine‘Traffic Jams’ of Cells Help to Sculpt Embryos – By measuring mechanical forces inside an embryo for the first time, researchers have shown how a physical “jamming” mechanism assists development.