Figure 9From: Pronuclear morphology evaluation for fresh in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) cycles: a systematic review Zygote scoring system of Balaban et al. [27]. The authors identified two group: group 1, zygotes corresponding to “pattern 0” of the original classification (A and B); group 2, zygotes showing a single PN; group 3, zygotes with 2PN originally classified as pattern 1–5 (C-G).Back to article page