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  • Title: Nucleotide sequence and secondary structure of apple scar skin viroid.
    Author: Hashimoto J, Koganezawa H.
    Journal: Nucleic Acids Res; 1987 Sep 11; 15(17):7045-52. PubMed ID: 3658673.
    Abstract:
    The complete nucleotide sequence of apple scar skin viroid(ASSV) has been established, and a probable secondary structure is proposed. A single-stranded circular ASSV RNA consists of 330 nucleotides and can assume the rodlike conformation with extensive base-pairing characteristic of all the known viroids. ASSV shows low sequence homologies with other viroids and lacks the central conserved region. These indicate that ASSV should be allocated to a separate viroid group. However, homologous sequences with potato spindle tuber viroid(PSTV) in ASSV occur in limited and scattered regions of both viroids. These homologous regions fall within the particular domains in the viroid domain model which has been previously proposed by Keese and Symons(Proc. Natl. Acad. Sci. USA. 82, 4582-4586, 1985).
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