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Xylem cell specification in roots. (A) Schematic illustration of longitudinal pattern of protoxylem (red) and metaxylem (blue) vessel cells in a root. (B) A Nomarski differential interference image of protoxylem (red arrowheads) and metaxylem vessels (blue arrowheads) in an Arabidopsis root. (C) Schematic illustration of radial cell patterning in the root stele. Red; protoxylem vessels (PX), blue; metaxylem vessels (MX), orange; procambial cells and green; phloem cells.
