RNA gel electrophoresis problem

Ruedi Schlaefli ruedis at bucher.ch
Tue Jun 10 10:46:23 EST 1997

Are the spots really radioactive or do you just see black spots on the
film? Black spots all over a film are often caused by bacteria which
reduce the silver in the film. Maybe also your exposure cassette is
contaminated with radioactivity. If you develop an unexposed film and a
film that was exposed in the empty cassette you will find the bug.

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