Example MCT particle-tracking results from pigs 3 and 6. Automatically tracked particles are shown in blue (left panels), and manually tracked particles are shown in green (right panels). Unmarked (i.e. not coloured) particles in the automatically tracked images were either not correctly detected or not tracked for a sufficient number of frames. Unmarked particles in the manually tracked images were not moving within that analysis time point. Red arrows in (c) indicate particles that were not correctly identified as moving by the automated tracking algorithm. Scale bar: 5 mm.