( A ) pulsed-field gel electrophoresis, described by Schwartz and Cantor ( 1984)
( B ) polyacrylamide gel electrophoresis, described by Schwartz and Cantor ( 1984)
( C ) plasmid field gel electrophoresis, described by Schwartz and Cantor ( 1984)
( D ) pulsed-field gyratory electrophoresis, described by Cantor (1987)
