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Growth curves of the various LTR deletion variants in SCP cells (A) and macrophages (B) as measured by RT assays. Virus strains with one or two API sites (−10 and −20 respectively), the AML site (AMLa), and CAAAT (CAAATa) deleted from the first copy of the repeat in the LTR and CAAAT deleted from the second copy of the repeat (CAAATb) are shown. kcpm, counts per minute (in thousands).
