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Fig.
3.5-2. Transverse section of water lily petiole (Nymphaea).
The large round, empty-looking cells marked by Xs are sieve tube
members, similar to those shown in longitudinal section in Fig.
3.5-1. The small angular cells (three are indicated by arrows) that are almost filled with red contents are
companion cells, which control the metabolism of the sieve tube members.
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