1. Migration of marker dyes in native polyacrylamide non-denaturing gels

	Gel %	Bromophenol blue (BP)	Xylene cyanole (XC)

	  3.5		 100			460
	  5.0		  65			260
	  8.0		  45			160
	 12.0		  20			 70
	 20.0		  12			 45

2. Migration of marker dyes in polyacrylamide denaturing gels

	Gel %	Bromophenol blue (BP)	Xylene cyanole (XC)

	  5.0		35			130
	  6.0		26			106
	  8.0		19			 75
	 10.0		12			 55
	 20.0		 8			 28

The exact distance between bands is influenced by percentage of agarose, time of electrophoresis, concentration of Ethidium bromide, degree of supercoiling and the size and complexity of the DNA.