(A) $P$-proteins (phloem proteins) are specialized proteins found in the phloem tissue of flowering plants. They are primarily associated with sieve t

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(A) $P$-proteins (phloem proteins) are specialized proteins found in the phloem tissue of flowering plants. They are primarily associated with sieve tube elements. Their main function is to seal the sieve pores in response to injury,thereby preventing the loss of phloem sap.