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. 2018 Apr 11;9:730. doi: 10.3389/fmicb.2018.00730

FIGURE 1.

FIGURE 1

PERV. (A) Genomic RNA. (B) PERV structure. (C) Proviral DNA and nucleotide positions of the main elements. PBS, primer-binding site; SD, splice donor site; ψ, packaging signal psi; SA, splice acceptor site; PPT, polypurine tract; MA, matrix; CA, capsid; NC, nucleocapsid; PR, protease; RT, reverse transcriptase; IN, integrase; SU, surface envelope protein; TM, transmembrane envelope protein; LTR, long terminal repeat; gag, group-specific antigen; pol, polymerase; env, envelope.