In case that the loading buffer (6x) was not diluted to 1x.
It was a 2% agarose gel.
I would expect smiley bands early on in the separation straightening out as the salt moves away from your dna sample later in the electrophoresis
I don't think it will affect the migration. possibly you will observe the dye, much denser than normal (1X) in the gel while electrophoresis.
You won't see any problems in Agarose electrophoresis! There night be a minor issue with SDS-PAGE as Paul Rutland mentioned.
Thank you very much for your answers!
Amy Johnson
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