theseus1 has been shown to regulate cell elongation in response to decreased cellulose synthesis. the most commonly described example of this is in coordination with the procuste1 mutant for decreased cellulose synthase activity ("prc1-1"). when prc1-1 is present, the1 greatly inhibits cellular elongation; however, when a less-functional mutant of theseus1 was used in combination with "prc1-1", the growth rate increased to somewhere between the natural growth rate and the the1 repressed growth rate. this shows that while a cell is able to expand further with decreased cellulose levels, the1 represses elongation because of the change in the rate of cellulose production. this is also thought to be another method of pathogenic response, as some pathogens inhibit cellulose production.