To determine whether the co‐culture clusters confer any migration advantages over single cells alone, undifferentiated HL‐60 Bcl‐2 cells alone, differentiated neutrophils alone, MDA‐MB‐231TD (tumor‐derived)[23] cells alone, and either a co‐culture of MDA‐MB‐231TD cells and mCherry‐labeled undifferentiated HL‐60 Bcl‐2 cells or a co‐culture of MDA‐MB‐231TD cells and mCherry‐labeled differentiated neutrophils were allowed to cluster overnight and plated for migration toward 10% FBS, a cancer cell chemoattractant, or fMLP, a neutrophil chemoattractant (Figure 8A). Here, BCL2 is linked to cancer.