 The study examined four different endocytotic uptake mechanisms in two types of cells, a mouse macrophage and a human alveolar epithelial type 2 cell line. The researchers found that the cells used in the study express different proteins related to endocytosis, such as flotillin-1, clathrin-heavy chain, and cable-in-1. They also observed that certain inhibitors could block the uptake of nanoparticles in some cases, suggesting that multiple endocytic pathways may be involved in the process. This article was authored by Dagmari Kuhn, Dimitri Vanhek, Benjamin Mitchin, and others.