In a follow-up study to understand the exact mechanism of uptake of "S. citri" cells by beet leafhopper gut cells, researchers developed a line of beet leafhopper cells called the CT1 cell line. They used this cell line to study how leafhopper cells interacted with "S. citri" cells "in vivo". After incubation of beet leafhopper cells with "S. citri cells", researchers used an electron microscope to see how cell lines interact. They found that "S. citri cells" were pressed against the cell membranes of "C. tenellus" cells, and they also observed invaginations of the cell membrane. They concluded that these sighting were consistent with previous studies which suggested that "S. citri cells" are taken up by beet leafhopper cells by endocytosis.