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. 2015 Jan 13;16(4):392–405. doi: 10.22074/cellj.2015.486

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Fig 4 — Zygote classification according to Scott et al. (19): Z₁ zygote (equal numbers of nucleolar precursor bodies (NPBs) aligned at the pronuclear junction) (A), Z₂ zygote (equal number and size of nucleoli which were scattered equally in the two nuclei) (B), Z₃ zygote (zygotes with unequal numbers or size of nucleoli in just one nucleus and equal number and size of nucleoli in another nucleus) (C) and Z₄ zygote (the pronuclei are located in the periphery or are separated with different sizes) (D).