biological_process
 |__reproductive process__
reproductive process      |
 |__sexual reproduction___|
                          fertilization  44 rec.
                           |__double fertilization forming a zygote and endosperm
                           |   |__fusion of sperm to egg plasma membrane involved in double fertilization forming a zygote and endosperm(+)
                           |   |__regulation of double fertilization forming a zygote and endosperm(+)
                           |__double fertilization forming two zygotes
                           |__regulation of fertilization 2 rec.
                           |   |__negative regulation of fertilization(+)
                           |   |__positive regulation of fertilization 1 rec.
                           |   |__regulation of double fertilization forming a zygote and endosperm(+)
                           |__single fertilization 40 rec.
                               |__acrosome reaction(+)
                               |__centrosomal and pronuclear rotation
                               |__egg activation(+) 15 rec.
                               |__female pronucleus assembly 2 rec.
                               |__fusion of sperm to egg plasma membrane involved in single fertilization(+)
                               |__male pronucleus assembly(+) 12 rec.
                               |__penetration of cumulus oophorus
                               |__penetration of zona pellucida
                               |__pronuclear envelope synthesis(+)
                               |__pronuclear fusion 9 rec.
                               |__pronuclear migration 4 rec.
                               |__respiratory burst at fertilization
                               |__sperm aster formation 4 rec.
                               |__sperm entry 1 rec.
                               |__sperm plasma membrane disassembly 2 rec.
                               |__sperm-egg recognition(+) 1 rec.