peroxisome P4 peroxisome Note that this peroxisome assembly pathway is described in the yeast Yarrowia lipolytica. See also the cellular component terms 'P1 peroxisome ; GO:0019819', 'P2 peroxisome ; GO:0019820', 'P3 peroxisome ; GO:0019821', 'P5 peroxisome ; GO:0019823', and 'P6 peroxisome ; GO:0019824'. A subform of peroxisome that corresponds to an intermediate in a peroxisome assembly pathway, which operates by conversion of peroxisomal subforms in the direction P1, P2 -> P3 -> P4 -> P5 -> P6. P4 peroxisomes are distinguished from the other subforms on the bases of buoyant density and protein content. cellular_component GO:0019822 peroxisome vesicle