For transmission electron microscopy (TEM) observation, inflorescences of primary shoots of Arabidopsis WT plants and clv3-2 mutant plants were harvested at each time point (1–6 WAB). The methods of sample fixation and sectioning were described previously (Yamaguchi et al., 2018 (link)). Photographs were taken using an H-7100 TEM (Hitachi, Japan).
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