AIntFIG 4: Yolk protein collects in the body cavity of old nematodes.

A. Nematodes expressing GFP tagged yolk protein (YP170/GFP). Top panel of day 1 young adult with yolk protein localized to developing embryos and intestine. Lower panel of a day 9, post-reproductive adult with yolk distributed throughout the body. (Images from Herndon et al., 2002.)
B. Lengthwise electron microscopy image of 15-day-old adult with yolk protein filling the body cavity (pseudocoelom). (Image source: N811 [Hall] E323 class C.)
C. Cross section from a methylene blue/paraosaniline stained 17-day-old adult showing yolk in the body cavity next to the intestine. By comparison, the cytoplasm of the aging intestine shows little yolk staining here (Image source: McGee et al., 2011; see also AIntVID 2.)

Click on picture for full resolution image.