Env 7-10: Gag ≈2,400 Copies/virion
||Chojnacki J et al., Envelope glycoprotein mobility on HIV-1 particles depends on the virus maturation state. Nat Commun. 2017 Sep 15 8(1):545. doi: 10.1038/s41467-017-00515-6 p.2 left column top paragraph & bottom paragrahPubMed ID28916807
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||Primary source  electron tomography, primary source  fluorescence nanoscopy, primary source  electron tomography and scanning transmission electron microscopy
||P.2 left column top paragraph: "During its assembly, human immunodeficiency virus type 1 (HIV-1) incorporates 7–10 copies of the trimeric viral envelope surface glycoprotein Env [primary sources 1, 2] and ≈ 2400 copies of the main structural protein Gag [primary source 3]—a polyprotein that initially assembles into immature virus particles (Fig. 1a)." P.2 left column bottom paragraph: "In a conventional single-point STED-FCS [Stimulated emission depletion-fluorescence correlation spectroscopy] or even FCS measurements, which usually take a few seconds, the small pool of 7–10 tagged Env molecules on an individual virus would photobleach rapidly within less than a second, and therefore this measurement modality is unsuitable."