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Root development stages by Tsilingaridis et al., 2016. 1–4‐ very immature; 5‐ immature; 6‐ mature. The stage of root development was classified as: 1 = one‐quarter root formation, 2 = one‐half root formation, 3 = threequarters root formation, 4 = full root formation, open apex, 5 = full root formation, half‐closed apex and 6 = full root formation, apex closed
