GlrFIG 2: GLR cells and their processes.
A. Cell bodies of GLR cells are aligned dorsoventrally, just posterior to the nerve ring on each side of the pharynx isthmus. A thin, leaf-like process grows out of each cell to wrap the interior of the muscle–neuron plates of the nerve ring (inset). At the anterior edge of the nerve ring, this process narrows down to a thin rod that joins the labial process bundles and travels anteriorly to the level of the anterior end of the pharynx, where it peters out.
B. Epifluorescent image from a transgenic animal expressing the gly-18::GFP reporter gene. The GLRL soma is seen on the lateral side of the isthmus. Anteriorly to the nerve ring region, the GLR process becomes quite thin and continues to travel along the lateral side of the pharynx, left lateral view. (Strain source: C.E. Warren, A. Krizus, and J.W. Dennis.)
C. Epifluorescent image from a transgenic animal expressing the C05D9.1::GFP reporter gene, left lateral view. The anterior GLR processes flatten out at the nerve ring (NR) region. (Image source: R. Newbury. The Genome BC C. elegans gene expression consortium [McKay et al., 2004].)
D. DIC image of the same animal as in C. Bar, 10 μm.
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