In endocytosis, material is taken into the cell and is transported around the cell in vesicles, or endosomes, with different functions and associated proteins. A recent paper has shown the transition of an early endosome into a late endosome, using live imaging of a scavenger cell called a ceolomocyte, in the worm C. elegans. Image above shows this transition, with early endosomes in green and late endosomes in red. The arrow is pointing to one particular endosome as it transitions into a late endosome.
Reference: Dmitry Poteryaev, Sunando Datta, Karin Ackema, Marino Zerial, and Anne Spang. Cell 141, 497-508. ©2010 Elsevier Ltd All rights reserved. Paper can be found here.