The fertilization process can be divided into three stages. The first stage is that a large number of capacitated sperm contact the radioactive crown around the egg cell and release acrosin to dissociate the radioactive crown of the egg cell; The second stage is the process of acrosome enzyme dissolving the radioactive crown and transparent band, namely acrosome reaction; The third stage is the fusion of the cell membrane on the side of the sperm head and the cell membrane of the egg cell, and then the nucleus and cytoplasm of the sperm enter into the egg cell, and the cell membrane of the sperm and the egg cell fuse into one body. At this stage, a zona reaction occurs
