Endogenous LC-3 punctae detected with AM20212PU-N LC3 antibody (Clone 5F10): The majority of LC-3 was diffusely localized in unstim ulated COS-7 cells, wheres punctated signals of LC-3 increase after induction of autophagy by vinblastin stim ulation for 2 hr. Cells were fixed with paraformaldehyd followed by methanol treatment. Cells were permeabilized with 0.3% TritonX100. Endogenous LC-3 was detected with mab 5F10. Images by courtesy of I. Ciechomska and A. Tolkovsky, University of Cambridge, UK.