Scheme showing a neutrophil (on top) undergoing apoptosis (the color change indicates the apoptosis), and encountering a macrophage (left). Both express uPAR (3 little spheres of the same color of the cytoplasm) and integrins (red bars). Through the interaction of these 2 proteins the neutrophil is efferocytosed into the macrophage (on the right). The scheme does not necessarily imply a direct uPAR-integrin interaction.