{HEAD ~ A flow cell} which can be used in {TAIL ~ the synthesis} of DNA probes on 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 
{ HEAD ~ A flow cell } which can be used in { TAIL ~ the synthesis } of DNA probes on 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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