Picture from Bowerman BA et al. (1993) Cell "The maternal gene skn-1 encodes a protein that is distributed unequally in early ...."
Figure 2. Distribution of Skn-1 Protein in Early Embryos.Fluorescence micrographs of a wild-type adult gonad and early embryos stained for Skn-1 protein (left column) and with DAR to visualize nuclei (right column). The gonad and embryos are oriented as shown in the schematic diagram in Figure 1.(a and b) Low magnification pictures of an adult gonad containing germ cell precursors (arrowhead) and maturing oocyte nuclei (arrows). (c and d) High magnification of an undivided, fertilized egg after the male (left arrow) and female (right arrow) pronuclei have met; the condensed chromosomes of both pronuclei are visible in (d), and the polar body resulting from the second meiotic division of the oocyte is visible on the far left of the panel. Skn-1 protein is detectable in both pronuclei (c).