In one aspect of the invention, {HEAD ~ an integrated assembly} useful in, e.g., {TAIL ~ sample analysis systems}, may be constructed according to the invention wherein complementary microstructures are formed by an etching or similar process in a planar substrate 
In one aspect of the invention , { HEAD ~ an integrated assembly } useful in , e.g. , { TAIL ~ sample analysis systems } , may be constructed according to the invention wherein complementary microstructures are formed by an etching or similar process in a planar substrate
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