Model organism protein blast matches (HSP groups):
Source proteomes are taken from model organism databases.
  modDM = Drosophila melanogaster (flybase) proteome
  modMM = Mus musculus (MGI) proteome
  modCE = C. elegans (WormBase) proteome
  modSC = Sacc. cer. (SGD) yeast proteome

Protein tBLASTn matches are  grouped by HSP overlap.  Names are protein ID + HSP group.
  ID Key: CG00000_G1 = primary Gene match (best hit), CG0000_G2 = secondary Gene  match on 
  same scaffold, CG0000_S[3..n] = tertiary and further matches of same protein on same scaffold as _G1,
  CG0000_o[1..n] = further matches on other scaffolds.  Matches at p <= 1e-3 are collected,
  secondary matches that mostly overlap better matches are removed.  HSPs are grouped by both
  protein fragment overlap (same part of protein) and target genome overlap.  HSP groups
  include several gene events: alternate splice exons in same gene, tandem and distant duplications,
  new genes composed of parts of several other genes, as well as computational artifacts.
  See <a href="http://insects.eugenes.org/species/news/genome-summaries/gene-GO-function-association/">
  here for further details and use in Gene Ontology groups</a> D. Gilbert, may 06

Example HSP GFF:
  source field = MOD database; score = blast bitscore; Parent= only for HSPs (no ID) with ID as above.
  tkey = protein target HSP group (location subset); tloc = protein target location; align = no. aa residues 
  aligned
##gff-version 3
scaffold_13340  modMM   HSP     13833673        13833942        79.0    -       .       Parent=MGI:88491_G1;tk
ey=MGI:88491-HSP:23-120;tloc=23-120;align=98
scaffold_13340  modDM   HSP     11004286        11004747         230    +       .       Parent=CG8236_G1;tkey=
CG8236-PA-HSP:1-153;tloc=1-153;align=154