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(D) $P$-protein is found in the sieve tube elements of the phloem.$A$ network of fibres composed of $P_1$ and $P_2$ proteins is present in the central

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Sieve tube

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(D) $P$-protein is found in the sieve tube elements of the phloem.$A$ network of fibres composed of $P_1$ and $P_2$ proteins is present in the central part of the lumen of the sieve tube.This protein network helps in controlling the movement of materials and,along with callose,assists in the sealing of sieve pores after injury to prevent the loss of sap.

$P$-protein is found in

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