Simons J A
Science. 1970 Mar 6;167(3923):1378-9. doi: 10.1126/science.167.3923.1378.
Glucagon elicits a twofold increase in delta-aminolevulinic acid synthetase activity in the livers of 18-day-old chick embryos. This rise occurs when RNA synthesis is inhibited, but is prevented when protein synthesis is blocked. Cyclic adenosine monophosphate appears not to be involved.