SPECIES_DBS a space separated list of ensembl core dbs in square braces
SPECIES_DB_AUTO_EXPAND to save listing all dbs for a given species this variable may be used to specify a set of replacement strings to attempt to connect to (e.g. specify SPECIES_DBS = [ homo_sapiens_core_83_38 ] and SPECIES_DB_AUTO_EXPAND = [ variation ] to also load the database homo_sapiens_variation_83_38, if it exists on [DATABASE]DB_HOST or DB_FALLBACK_HOST
MULTI_DBS - a space separated list of multispecies databases in square braces