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