evocation

https://doi.org/10.1351/goldbook.10690

Specific induction of a tissue within a developing embryo that results from the action of a single hormone or other chemical (the evocator).

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 752 [Terms] [Paper]