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Schematic of the plant root, showing the different cell subtypes of phloem cells, which transport sucrose around the plant and ultimately give rise to the starch in foods. Phloem tissue is born from stem cells toward the bottom of the conical root tip and are then pushed upward as they mature along an assembly line. Researchers dissected the 19-cell developmental trajectory of phloem cells from their birth to maturation in a journey of 19 cell positions. The graph on the right shows a computational analysis of single-cell states along the trajectory, where "pinch points" mark dramatic developmental transitions. The research involved finding the genetic mechanisms that control the developmental transitions and the regulatory "code" to the construction of phloem.