Browse the following categories:

Having transposon insertions but are not genes
  (type3='torf')

Having a homology match in genomic databases but are not genes
  (type2='whorf')

Bad genes: genes that have never been expressed, have no sage tags, no transposons
  (type1='gene' and expr_level<0.1 AND tags=0 AND transposons=0)

Essential genes
  (essential='y')

New genes identified by homology searching or transposon tagging