Nandi Majumdar A P
Experientia. 1978 Oct 15;34(10):1258-9. doi: 10.1007/BF01981403.
Whereas in young rats (2 weeks old), administration of typtophan produced marked enhancement in the activity of both engaged and free polymerases of nuclei, in adult rats (10 weeks old) only the engaged polymerases showed higher activities following tryptophan force-feeding.