PMN were treated with 1 µM PPP (blue) or 50 ng/ml IGF1 (green) for 30 min before assessing axonal transport using 30 nM AlexaFluor555-HcT. Example of HcT-containing organelle tracking in the axon of PMN. Each colour denotes a single endosome tracked over time. The scale bar is 10 µm. 