Identification of hierarchical cluster screening algorithms. Four types of movement data derived through cell tracking were used either independently (black text) or in 2 variable (blue) or 3 variable (red) combinations to hierarchically screen for nuclei that belong to one of the four categories of movement. Boxes containing a “Y” generate efficient clusters for that movement category. Green boxes represent exclusive clustering of cases belonging to that movement. Red boxes indicate clustering of cases from 2 or more movement categories, and were therefore, not useful for screening for individual movements.