Histological sections from S. moellendorffii roots sampled during the root branching time course. A and B, A newly branched root tip containing two apical meristems sampled on Day 0; (B) is a magnification of the indicated area in (A). The inset in (B) shows a magnification of the IC and its neighboring region. The initial and the presumptive most recent daughter cells are indicated by dotted lines. The hollow arrows indicate the expected directions in which the IC cuts off daughter cells from the different faces. Scale bars: 50 µm, except for the inset: 10 µm. C–G, Early-stage bifurcating meristems with two presumptive ICs next or close to each other. The insets show a magnification of the indicated area, the arrows indicate the ICs. Scale bars: 50 μm, except for panel (C), (D) and the insets: 10 µm.