sentences:  Furthermore, it act as a hormone stimulator of its biosynthesis.Thus, "Blakeslea trispora" requires certain concentrations of TSA to activate carotenogenesis and produce more carotenoids (about 0.5% of its dry weight) which can be accumulated in the zygospores of "B. trispora".Therefore, both TSA and trisporoid acts as sex hormones in "Blakeslea trispora", which triggers the sexual reproduction and controls intimate contact between heterothallic strains, further governing the formation of sex structures, zygospores.