ghost band

Noun

 * 1)  Any spurious results clustered together, outside of normal expected ranges (as in a plot of recorded energy values, with an inexplicable blot, marring the clean expected results).
 * 2)  A large band or stripe that appears on a developed gel as a wide halo with no specific, distinguishable signal.
 * Ghost bands are a common problem in western blot analysis.
 * 1)  Impersonators of a well-known musical band hired to perform while the real band members are elsewhere.