IntFIG 2: Cells of the alimentary canal posterior to the pharynx.
A. A 430-minute embryo. Germ cell precursors extend lobes into the int5 cells, possibly to obtain nutrition. In newly hatched larva (inset), the arrangement of intestinal cells reflect the second 90o turn that takes place around the longitudinal axis in the posterior. Also, the germ line has taken its L1 form. (Asterisks) Cells with microvilli on their apical surfaces. Graphic rendition (Modified, with permission, from Sulston et al., 1983 ©Elsevier).
B. Rectal epithelial cell Y becomes the PDA neuron at later larval stages. Epifluorescent image of PDA in a transgenic animal expressing exp-1::GFP reporter, left lateral view. (Strain source: A. Beg and E. Jorgensen.) Magnification, 400x.
C. Intestinal cells are large with prominent nucleus, nucleolus and various sized vacuoles (arrowhead). (Top) DIC image of the posterior intestine, ventral view. (Bottom) Epifluorescent image of the same area in a transgenic animal expressing the reporter gene pW02H5.8-NLS::GFP. (Strain source: M. Molin, A. Blomberg and M. Pilon.) Magnification, 600x.
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