(sciences) 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).
(biology) 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.
(entertainment) Impersonators of a well-known band hired to perform while the real band members are elsewhere.
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