Figure 1. DNA fingerprints obtained for cell lines after DNA amplification with primers INS (A and B) and M13 (C and D). Top of the gels, Concentration of MgCl₂ (mM) in the amplification reaction. The arrow points to the concentration of magnesium used as the standard for DNA amplification of these cells. Lane M, 1-kb ladder; lane 1, HeLa; lane 2, HEp-2; lane 3, McCoy; lane 4, NIE-115; lane 5, McCoy; lane 6, C6 36; lane 7, Sf-9; lane 8, VH2.