Murine Atg8L⁄Apg8L has significant homology with the other known mammalian Atg8 homologs, LC3, GABARAP and GATE-16. However, it is unclear whether murine Atg8L modification is mediated by human Atg4B, Atg7 and Atg3. Expression of Atg8L in HEK293 cells led to clea-vage of its vitro, the C-terminus of Atg8L was cleaved by human Atg4B, but not human Atg4A or Atg4C.