Intracellular @E01901@ substance increasing or decreasing as a response to the stimulation of a @RT06841@ by an @A00186@, considered as the 'first messenger'.
Source: PAC, 2004,
76, 1033. (
Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003)) on page 1070 [
Terms] [
Paper]