Figure 3. ASNA1 Is Expressed in Cells that Produce Insulin or Insulin-Like Proteins in Humans and C. elegans. (A and C). Micrographs of worms of the genotype svIs56 viewed with Nomarski DIC optics. svIs56 is a transgene array containing full-length
asna-1::GFP under the control of the
asna-1 promoter. Arrows in (C) indicate the position of the intestine. (B and D). Micrographs of the same worms viewed with fluorescence optics. Scale bars are 25 μm. The amphid neurons ASI and ASK are indicated. Arrow in (D) indicates cells expressing the fusion protein. (E-H) Micrographs of human pancreatic tissue viewed with fluorescence optics (E and F) or light optics (G and H) at 40 magnification. (F and H) Tissue stained with an antibody recognizing human insulin. (E and G) Tissue stained with an antibody recognizing human ASNA1. The arrows indicate cells expressing insulin and ASNA1. The arrowheads indicate other pancreatic islet cells that express neither insulin nor ASNA1. (G) and (H) show consecutive thin sections; the regions stained brown (indicated by arrows) are those expressing insulin and ASNA1, respectively.