nucleotide sequence analysis revealed the following characteristic features in the prfm # 6 provirus : a distinct 200 bp sequence in the long terminal repeat ( ltr ) mid-u3 region , a primer binding site for glutamine trna , a 3 ' pol region encoding an 'endonuclease ' protein of 390 amino acids , and the mink cell focus-forming virus type-specific sequence at the 5 ' portion of the env gene .
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