AExcFIG 4: Excretory cell structure near the posterior pharynx during aging.

AExcFIG 4: Excretory cell structure near the posterior pharynx during aging.

A. Diagram of the C. elegans head showing the approximate positions of photomicrographs B,C&D by shaded box in the posterior portion of the pharynx adjacent to the pharygeal-intestinal valve.
B,C,D. Transverse sections from a young adult (B) and two day 15 adults (C&D). The bilateral excretory canals are colored in pink. The apical borders are smooth in the young adult, becoming disorganized and ruffled in both day-15 adults. Lower panels, closeups of individual excretory canals as shown. One excretory cell (D) contains two lumens, the other cells contain one lumen.
D
. Both excretory canals appear to contain fewer canaliculi than the other animals.
C. Bar, 5 microns. (Image source: B: N513A [D. Hall] G534 M1 959, C: N829 [D. Hall] W001, D: N829 [D. Hall] R128).

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