Differential gene action in Neurospora crassa.

Molecular hybridization experiments with pulse-labeled total ribonucleic acid (RNA) or isolated nonribosomal rapidly labeled RNA species and deoxyribonucleic acid from growth periods of 8, 16, and 24 hr of Neurospora crassa showed differential transcription. Hybridization competition experiments between RNA species isolated from 8, 16, and 24 hr of growth showed qualitative differences in the types of RNA synthesized during these periods.