A flow cell which can be used in the synthesis of {HEAD ~ DNA probes} on {TAIL ~ an active surface} of the substrate includes a base having a central window opening and a registration surface against which the substrate may be mounted 
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A flow cell which can be used in the synthesis of { HEAD ~ DNA probes } on { TAIL ~ an active surface } of the substrate includes a base having a central window opening and a registration surface against which the substrate may be mounted
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