thumb|right|Fly with legs in place of antennae, caused by Antennapedia mutation thumb|right|The two Hox gene complexes in fruit flies Antennapedia (abbreviated Antp) is a Hox gene first discovered in Drosophila which controls the formation of legs during development. Loss-of-function mutations in the regulatory region of this gene result in the development of the second leg pair into ectopic antennae. By contrast gain-of-function alleles convert antennae into ectopic legs.
thumb|right|Fly with legs in place of antennae, caused by Antennapedia mutation thumb|right|The two Hox gene complexes in fruit flies Antennapedia (abbreviated Antp) is a Hox gene first discovered in Drosophila which controls the formation of legs during development. Loss-of-function mutations in the regulatory region of this gene result in the development of the second leg pair into ectopic antennae. By contrast gain-of-function alleles convert antennae into ectopic legs.
This is just one illustration of the tendency of organisms to exhibit variations on a theme: modulated repetition. Legs and antennae are related to one another as much as molars are to incisors, fingers are to toes, and arms are to legs.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).