The epithelial cells were pinocytosing nutrient-rich fluid as they repaired the damaged tissue.

In nutrient-poor water, the unicellular organism pinocytoses dissolved organic molecules to sustain itself.

During the experiment, the cultured cells pinocytosed the labeled dye, allowing researchers to track fluid uptake.

To study nutrient uptake, researchers asked whether macrophages could pinocytose the extracellular fluid surrounding the tumor.