Small molecular inhibition of matrix metalloproteinases (MMPs). (A) Graphical representation of M2 and MDA-MB-231 cells treated with the MMP inhibitor GM6001 over 5 days. Inhibition of MMP expression reduces the amount of invasion of breast cancer cells. (B) Representative images of MDA-MB-231 cells that have migrated to the collagen fibres or M2 cells that have located to the caudal hematopoietic tissue. Scale bar = 100 μm. Data are representative of three independent experiments with at least 50 embryos per group. Errors bars represent standard deviation.