Fig. 4. The expression of histone H1.X::GFP in C. elegans body muscle cells (A,C) and in the vulva muscle cells (E). H1.X::GFP is prominently localized in the cytoplasm but also enriched in the nuclei. (B,D,F) represent the corresponding Nomarski micrographs. The arrows points to individual body-wall muscle cells and the nuclei therein and to the vulva opening. Bars, 20 µm.