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Representative TEM micrographs of infected sieve elements illustrate an adhesion of phytoplasmas to the sieve-element endoplasmic reticulum (SE-ER) (A–D). The junction sites seldom show clear-cut outlines. In insets i and ii, areas of interest of (A) and (B) are magnified. Arrows = phytoplasmas; arrow-heads: phytoplasma-SE-ER contacts; asterisks: SE-ER; pp.: sieve-element protein.
