![]() Although virions of different retroviruses do not have the same morphology or biology, all the virion components are very similar. Interaction sites between the two RNA molecules have been identified as a " kissing stem-loop". The two molecules are present as a dimer, formed by base pairing between complementary sequences. The virions also contain two identical single-stranded RNA molecules 7–10 kilobases in length. The outer lipid envelope consists of glycoprotein. Virions, viruses in the form of independent particles of retroviruses, consist of enveloped particles about 100 nm in diameter.
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