Maximum likelihood phylogenetic trees of intact NFL sequences obtained by Q4PCR and MIP-seq ( Einkauf et al., 2019 ; Lorenzi et al., 2016 ). Filled circles represent inducible clones, and the number of circles is proportional to the size of the clone. Outlined circles represent NFL HIV-1 clones detected by PCR, but not by outgrowth assays. Black circles represent unique proviruses detected only once. Integration sites indicated by adjacent text. *Viral outgrowth assay not performed.