Abstract
The combination of intracytoplasmic sperm injection (ICSI) with oocyte activation has resulted in pregnancies and the birth of healthy babies for patients with repeated fertilization failure after ICSI. However, the introduction oocyte activation into human assisted reproductive technology faces significant risk because every mammal oocyte undergoing oocyte activation has the possibility of becoming parthenote, which is not capable of developing to term due to genomic imprinting. Some genomic imprinting genes, such as insulin-like growth factor II (IGF-II) that is expressed from the paternal allele play a key role in mammalian growth.
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