The present invention is directed to an improved flow cell of the type that may be utilized in the synthesis of arrays of DNA probe sequences, polypeptides and the like, and is particularly adapted to be used with image formers for projecting an array of patterned light onto {HEAD ~ a substrate} held by {TAIL ~ the flow cell} 
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The present invention is directed to an improved flow cell of the type that may be utilized in the synthesis of arrays of DNA probe sequences , polypeptides and the like , and is particularly adapted to be used with image formers for projecting an array of patterned light onto { HEAD ~ a substrate } held by { TAIL ~ the flow cell }
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