◉ The number of nuclear precursors (NPB) in 1PN blastocysts is significantly higher than in 1PN (prokaryotic) arrested embryos.

◉ Prokaryotic area and diameter, and the number of NPBs were also associated with their embryonic developmental potential.

◉ PN area >750m2 - higher embryo quality Higher pregnancy rate

◉ NPB> 12 - higher quality embryos Higher pregnancy rates

◉ The nucleolar precursor body (NPB) count in 1PN blastocysts was significantly higher compared to that of the 1PN(Pronucleous) arrested embryos, and the number of embryos that were arrested in 1PN(Pronucleous) was significantly higher than that of the 1PN(Pronucleous) arrested embryos.

◉ Pronuclear area and diameter, the number of NPBs is also associated with their developmental potential.

https://www.cambridge.org/core/journals/zygote/article/are-the-number-of-nucleolar-precursor-body-and-size-of-pronuclear-correlated-with-embryo-development-and-ploidy-status-in-1pn-zygotes-an-analysis-through-the-timelapse-monitoring-and-preimplantation-genetic-testing/ED3FC799FD9F027FF7C588C397DCA60E