Acknowledgements This work has been supported by National Bioscience Database Center (NBDC) of Japan Science and Technology Agency (JST). WURCS-WG acknowledges the use of the following databases. GlyTouCan: https://glytoucan.org GlycomeDB: http://www.glycome-db.org UnicarbKB: http://www.unicarbkb.org/ CarbBank: University of Georgia