Fig. 3.

Differentiated clone 15 HL-60 cells (diff HL-60) augment fibroblast-mediated collagen gel contraction. Clone 15 HL-60 cells were differentiated (IL-5, IL-3, GM-CSF) and cast together with fibroblasts in collagen gels. Undifferentiated clone 15 HL-60 cells (HL-60) were used as control cells. Vertical axis: gel area expressed as percentage of original gel size. Data presented as mean of triplicate and standard error of mean (± s.e.m.). P < 0·001: HFL1/HL-60 versus HFL1/diff HL-60 on days 2, 3 and 4.