 The study examined for 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 expressed different proteins related to endocytosis, such as flotillin-1, clathrin-heavy chain, and cavolin-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 Dagmar A. Kuhn, Dmitri Vanhek, Benjamin Michen, and others.