Editor's note, 5/9/18 5:32 PM EDT: This post originally stated that the researchers had made a model of embryonic stem cells. They had, in fact, used hiPSCs, which are derived differently.

Plants take up water from the soil via the roots and transport it through a vascular system, the so-called xylem, into the canopy. The xylem is a network of tubular cell wall containers that are ...