Bmp1 protein activity in the intestines of nematodes. (A) Localization of the Rho and FITC in C. elegans intestines. The confocal laser scanning microscope image showed the localization of the Rho, FITC, or Rho+FITC in C. elegans intestines. Nematodes were incubated with labeled protein four different times, and then the images were merged. (B) C. elegans intestinal tissues observed under a light microscope after feeding with Cry5Ba and Bmp1 at different times. Original magnification, ×1,000. The arrows point to the nematode intestines.