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

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Fig 1 — A. Classification of pronuclear morphology according to Brezinova et al. (18). Pattern " O", is defined as the same number of small nucleolar precursor bodies (NPBs) distributed in the nucleus or large NPBs with polar distribution between the two pronuclei. B. Classification of pronuclear morphology according to Brezinova et al. (18). Pattern " Other", Zygotes with nonsymmetrical alignments of NPB.