- A short usually highly conserved DNA sequence in various genes and especially homeotic genes that encodes a homeodomain.
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
- A short stretch of nucleotides whose base sequence is virtually identical in all the genes that contain it. Homeoboxes have been found in many organisms from fruit flies to human beings. In the fruit fly, a homeobox appears to determine when particular groups of genes are expressed during development.
Definition from: Human Genome Project Information
at the U.S. Department of Energy
See also Understanding Medical Terminology.