Lists all organisms present in the KEGG database.

    :returns: a dataframe containing one organism per row.

def organismsKEGG():
    """
    Lists all organisms present in the KEGG database.

    :returns: a dataframe containing one organism per row.

    """
    organisms=urlopen("http://rest.kegg.jp/list/organism").read()
    organisms=organisms.split("\n")
    #for o in organisms:
    #    print o
    #    sys.stdout.flush()
    organisms=[ s.split("\t") for s in organisms ]
    organisms=pd.DataFrame(organisms)
    return organisms