theseus1 was discovered, along with the other members in its family of rlks, while researchers were attempting to describe a pathway of monitoring cell-wall stability in plant cells. it was first characterised from its interaction with a procuste1 mutant ("prc1-1"). this procuste1 mutant produces less cellulose because of alterations to the cellulose synthase site, resulting in drastically decreased cell wall elongation. when the1 was also mutated in the presence of the "prc1-1" mutant, the rate of cell elongation was increased to half-way between the normal growth and the "prc1-1" only growth rate. because of this interaction, it was named after theseus, the mythological founder of athens and killer of procrustes. theseus 1 was originally found in, and is still most commonly obtained from, "arabidopsis thaliana."