Letter code		Organism
HS			Homo sapiens
HSI			Homo sapiens (intergenic frequencies)
MM 			Mus musculus
MMI			Mus musculus (intergenic frequencies)
CFI			Canis familiaris (intergenic frequencies)
RN			Rattus norvegicus
DM			Drosophila melanogaster
SC			S. cerevisiae
FR			(Taki)Fugu rubripes
DR			Danio rerio
AT			Arabidopsis thaliana
GG			Gallus gallus
CE			C. elegans
AG			Anopheles gambiae
AN			A.nidulans
CI			Ciona intestinalis
XT			Xenopus tropicalis

BEC			E.coli K12
BBS			Bacillus subtilis