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(A) Structure of the Ppcrt copia-like retrotransposon of Japanese pear. (B) Nucleotide sequences of five RBIP markers and the Ppcrt4 retrotransposon. LTR, long terminal repeat; PBS, primer binding site; GAG, group-specific antigen; POL, RNA-dependent DNA polymerase; PPT, polypurine tract; F-primer, forward primer; R-primer, reverse primer. Forward primers in B are indicated by italics and underlined, and reverse primers are boxed.
