Genes that restrict the action of other genes to specific regions of the organism. An example of such a boundary-setting gene is SUPERMAN in Arabidopsis thaliana (q.v.). Flowers that contain inactive alleles of SUPERMAN have stamens in whorl 4. Since stamens require activities B and C (see floral organ identity mutations), these abnormal flowers suggest that genes capable of producing B are normally inhibited in whorl 4 by cadastral genes like SUPERMAN.
Subjects: Genetics and Genomics.