Squamous cell carcinoma cells possess a cell surface protease, referred to as guanidinobenzoatase (GB). GB is a plasminogen-activator-like enzyme which can be located by the fluorescent probe 9-amino acridine in frozen sections. Fluorescence microscopy has been used to study the inhibition of this GB, the displacement of inhibitor from GB, the displacement of GB from the cell surface receptor and the preparation of both active GB and inhibitor, obtained from these frozen sections of tumour tissue.
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