Program desired sequences Light Solid surface Opaque screen over spots 1, 2, and 3 Light Photolabile blocking groups Opaque screen over spots 2 and 4 O Light Opaque screen over spots 1 and 3 Many more...

Figure 9-22 shows the first steps in the process of making a DNA microarray, or DNA chip, using photolithography. Describe the remaining steps needed to obtain the desired sequences (a different fournucleotide sequence on each of the four spots) shown in the first panel of the figure. After each step, give the resulting nucleotide sequence attached at each spot.

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