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. 2021 Mar 14;28(28):37616–37626. doi: 10.1007/s11356-021-13242-9

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© The Author(s) 2021

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Fig. 1 — Example of stomata counting (a) and measuring (b) in a control sample of Spagnolo cardoon. Pb-treated samples of Spagnolo (c) and Siciliano (d) leaf replicas. Note the higher number of smaller stomata in the first; see paragraph 3.1 for further details