DNA Sequencing Artifacts

[Eric W. Linton]

Hi,
         We have noticed that when we sequence, using cycle  sequencing on
the SSU rDNA, that when a primer does not work or more often when a primer
works and it runs to the end of the template, that after it ends there is
still a ³ghost² sequence above where the actuall sequencing reaction
ended.
         Does anyone else have this occuring? If so does anyone know what
that sequence is? It is very light and apparently the same no matter what
primer is used, either forward or reverse. 

TIA
Eric

-- 
Eric Linton
Rutgers, The State University of New Jersey
Cell and Developmental Biology
E-mail: elinton at rci.rutgers.edu
web page: http://www.rci.rutgers.edu/~elinton
snail mail:
        Rutgers/Nelson Labs C-109
        P O Box 1059
        Piscataway, NJ 08855-1059