P-protein

Protein found in large amounts in phloem sieve tubes. Appears as thin strands when seen in the electron microscope.

P-protein

(from the article `sieve tube`) The small pores of sieve cells and the larger ones of sieve elements are traversed by strands of cytoplasm called P-protein. It is not known whether ...
Found on http://www.britannica.com/eb/a-z/p/1
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