Cover: Design by Eddy Arnold based on the TIGR Gene Index home page at http://www.tigr.org/tdb/tgi.shtml. The TIGR Gene Indices use EST and gene sequence data to reconstruct and annotate transcript sequences in nearly 30 species. For further details see the paper by Quackenbush et al. in this issue: Nucleic Acids Res. (2001) 29, 159-164.
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