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| Description: The scanning electron micrograph on the left shows sieve plates on the ends of two side-by-side sieve-tube members. Sieve plates in two columns of phloem are visible in the light micrograph of squash (Cucurbita) on the right. Rings of lignin are visible as red stripes in xylem vessel members. Older vessels stretch longitudinally as cells in newer tissue lengthen.
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