PhaFIG 12: Pharyngeal-intestinal valve (vpi) is composed of six cells: one vpi1, three vpi2 and two vpi3.

A. Horizontal TEM section through the pharynx-intestine junction. Each valve cell occupies a thin wedge-shaped domain surrounding some of the lumen of the valve. Bar, 1 μm. (Image source: Hall archive.)
B. Adjacent thin section showing the valve cells in higher resolution. (Arrowhead) vpi1 projection into pm8, which is sealed to pm8 by adherens junctions. Bar, 1 μm.(Image source: Hall archive.)
C. Epifluorescent image of the valve expressing the reporter gene hum-1::GFP, lateral view. (Strain source: M. Titus.) Magnification, 400x.

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