•  1PN 囊胚中的核前體 (NPB) 數量明顯高於 1PN（原核）停滯胚胎的數量。
• 原核面積和直徑、NPB的數量也與其胚胎發育潛力有關。
• PN 面積>750m2-----胚胎品質較高  懷孕率較高
• NPB> 12-----胚胎品質較高  懷孕率較高

• the nucleolar precursor body (NPB) count in 1PN blastocysts was significantly higher compared to that of the 1PN(Pronucleous) arrested embryos,
• Pronuclear area and diameter, the number of NPB 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