Keywords: سطح گلیکوپروتئین; 5â²UTR; 5â² untranslated region between the LTR and gag; A; Ala; BCFU; blue cell focus units; CA; capsid; cTAR; complementary trans-activation response DNA element; dsDNA; double-stranded DNA; ERT; endogenous reverse transcription; F16; Phe16; FA; fluor