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Hyaluronic acid (HA) is a major component of the cumulus complex surrounding oocytes. Intracytoplasmic sperm injection (ICSI) involves injection of a selected sperm into the oocyte. Embryologists select sperm with normal morphology and progressive motility. Physiologic intracytoplasmic sperm injection (PICSI) involves sperm selection for ICSI based on hyaluronan binding. Mature sperm which bind to HA have greater genomic integrity and reduced levels of DNA fragmentation. Earlier observational studies demonstrated improved outcomes in assisted reproductive technologies (ART) including improved clinical pregnancy rates, decreased miscarriage rates and higher live birth rates. A large multicentre randomized trial, the HABSelect trial, which included over 2,500 couples, found that PICSI did not improve term (\>37 weeks gestation) live birth rates compared to standard ICSI. However, mechanist
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