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. 2016 Jun 30;8(2):87–100.

Fig. 1.

Fig. 1

— Embryo scoring at the pronuclear stage (Z1 = equal pronuclei, equal number and size of nucleoli, aligned in both pronuclei at the pronuclear junction, number of nucleoli 3 to 7; Z2 = equal pronuclei, equal number and size of nucleoli, scattered in both pronuclei, number of nucleoli 3 to 7; Z3 = equal pronuclei, equal number and even or (and) uneven size of nucleoli, aligned in one pronucleus at the pronuclear junction, number of nucleoli 3 to 7; Z4 = unequal or separated pronuclei) (from Scott et al., 2000).