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. 2016 Jan 20;6:19357. doi: 10.1038/srep19357

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(a) Timing of second polar body extrusion (Pb2) and pronucleus formation (PN) in young and aged eggs activated with SrCl₂. Note that the timing of both egg activation events are similar, regardless of egg age. (b) Correlation between second polar body timing and oscillation number (total) between young and aged eggs. (c) Correlation between pronuclear formation timing and oscillation number (total) between young and aged eggs.