(G-K) HPK-1::GFP expression. The expression construct is shown in Figure 1. To monitor GFP expression in living embryos, two-photon laser scanning microscopy was used on mounted embryos. (G) A translational fusion protein between
hpk-1 and gfp localizes to nuclei and is widely expressed in cleavage stage embryos. (H) After 4 min, the number and location of HPK-1-GFP puncta within the embryo has dramatically changed. (J) The boxed region is shown at 1-min intervals. The puncta within the highlighted nucleus rapidly rearrange (arrowheads). (K) A fluorescence micrograph of HPK-1-GFP at postembryonic stages. In adult animals, the number, intensity, and movement of HPK-1-GFP puncta (arrowhead) are greatly reduced.