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Effects of protein A neutralizing antibody on OV-90 cancer cell invasion into the chick chorioallantoic membrane (CAM). OV-90 cancer cells were mixed with matrigel and (a) control anti-mouse IgG (20 μg/mL); or (b) neutralizing antibody against protein A (20 μg/mL). CAM paraffin sections (6 μm) were immunostained with a pan-cytokeratin antibody. ET = ectoderm. M = mesoderm. ED = endoderm. CM = cancer cell matrigel grafts. Original magnification ×200, scale bar 100 μm.
