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(a) Schematic representation of the phytomer concept proposed for plant shoots. Phytomers along the shoot are sequentially labeled from young to old and include one leaf (L), one axillary bud (AB) and one associated stem fragment each. SAM, Shoot apical meristem. (b, c) Comparison of cross-sections from a primary (b) and secondary (c)Arabidopsis stem. Pictures taken and adapted from [71].
