Source:http://linkedlifedata.com/resource/umls/id/C1136227
MSH: A growth from a pollen grain down into the flower style which allows two sperm to pass, one to the ovum within the ovule, and the other to the central cell of the ovule to produce endosperm of SEEDS.,GO: A tubular cell projection that is part of a pollen tube cell and extends from a pollen grain. [GOC:tb, PO:0025195, PO:0025281]