“The model put forward for the action of BDL suggests that auxin is involved in determining hypophyseal cell fate at the octant stage.”

“Tryptophan is used in some plant species as a precursor to bioactive alkaloids and defence phytoalexins, as well as the phytohormone auxin.”

“Another family of plant hormones, the gibberellins, regulate stem elongation and have some similar effects to auxin.”