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Tea seedling development process and sampling time point. a Samples of tea seedlings at different developmental periods: SE, seed; S1, seed germination and exposure of radicle growth point (10 days); S2, first growth of radicle (20 days); S3, growth of shoots (30 days); S4, growth of true leaves (40 days). b Schematic of longitudinal sections of the four developmental stages selected for MSI analysis, showing detailed morphological features and main compartments.
