We are interested in the modeling and study of autophagy, a cellular process, that destroys nocive elements such as old mitochondria. To enable this, the cell creates a structure called autophagosome. Hereafter you will find a scheme (from Claudine Kraft and Sascha Martens. Mechanisms and regulation of autophagosome formation. Current Opinion in Cell Biology , 24(4):496 – 501, 2012) that shows the different steps in the formation of the autophagosome. This structure is an aggregate made out of two kind of proteins : proteins such as LC3B that are found in membranes and p62. p62 can bind to Ubiquitin, a protein known to be a marker, for elements to be destroyed. So that p62 is the intermediate between the nocive elements and the membrane of the autophagosome that grows around, and enwraps it.