| Falling levels of plant hormones such as auxin and the cytokinins are responsible. |
| Tryptophan is used in some plant species as a precursor to bioactive alkaloids and defence phytoalexins, as well as the phytohormone auxin. |
| The model put forward for the action of BDL suggests that auxin is involved in determining hypophyseal cell fate at the octant stage. |
| Cytokinins, gibberellins, and auxin have been applied to promote cell division during the early stages of fruit growth in many species. |
| The news release relates to auxin, a plant hormone known to function in plant growth and development. |
| Hormones that require amino acids for starting materials include thyroxine, and auxin. |
