You clicked somewhere within the rectangle defined by the two corner points (8, 93) and (121, 161). The diagram illustrates a rough idea of what RNA Polymerase scanning a DNA molecule would look like. The rectangle is drawn around one of the DNA strands.

The line in the imagemap file that defines what to do if you click within the rectangle has the following syntax: 

rect http://zenith.berkeley.edu/~seidel/ClrHlpr/glob2.html 8,93 121,161

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