They then determined the gene frequency using RNA analysis and were so able to confirm the bone lining cells as the primary target cells. (sciencedaily.com)
And since the gut is also full of microbes, the intestinal lining cells are on the front lines, interacting with bacteria. (sciencedaily.com)
This is a picture of germ line cells of C. elegans showing PIWI and piRNAs (red dots) located outside of germ cell nuclei (blue circles) to scan for RNA passengers that move from nuclei to cytoplasm. (sciencedaily.com)