Fig. 4From: Phenotypically sorted highly and weakly migratory triple negative breast cancer cells exhibit migratory and metastatic commensalismCo-culture spheroids exhibit leader–follower behavior. A Representative images of migration strands featuring leader–follower behavior in 1.5 and 4.5 mg mL−1 collagen gels 24 h post-embedding. B Average number of leader cells per spheroid. C Relative percentage of leader cells for MDA+ and MDA− cells in MDAMIX spheroids in 1.5 and 4.5 mg mL−1 collagen gels; **p < 0.01Back to article page