Viroids are small covalently closed circular single-stranded RNA molecules which contain 246–463 nucleotides and have no protein coat or mRNA activity. In citrus a series of viroid-like RNA in the range of 275–375 nt was reported with different infectivity on a group of citrus indicator hosts. The authors wish to thank the Council of Centers of Excellence and the Iranian Chapter of TWAS (ISMO) for supporting this research.
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