Source:http://linkedlifedata.com/resource/umls/id/C1135843
MSH: Chemical substances, excreted by an organism into the environment, that elicit behavioral or physiological responses from organisms of a different species . Perception of these chemical signals may be olfactory or by contact. Allelochemicals are subdivided into several groups depending on the response of the receiver and its adaptive effect to the emitter. They can be allomones, kairomones, or synomones.