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Fig. 7. Model for hth regulation. The two horizontal bars indicate
expression of the two regulators: the Dpp signalling pathway and eyg.
In the anterior (A) part of the disc, eyg is expressed but the levels
of Dpp signalling are too low to repress hth. In the inter-subdomain
region, eyg is present and the levels of Dpp signalling are
sufficient to repress hth. Close to the posterior (P) border of the
disc, high levels of Dpp signalling are present, but there is no eyg
activity and hence hth is not repressed.