Elsevier Inc. spliceosome pathway 3'-end pre-mRNA processing pathway 5'-end pre-mRNA capping pathway mRNA maturation pathway pre-mRNA transcription rRNA maturation pathway tRNA maturation pathway RNA polymerase III transcription pathway ---> pre-rRNA transcription RNA polymerase II transcription pathway ---> pre-mRNA transcription RNA polymerase I transcription pathway RNA polymerase II transcription pathway chromatin modification/remodeling pathway ---> RNA polymerase II transcription pathway chromatin modification/remodeling pathway RNA polymerase III transcription pathway chromatin modification/remodeling pathway ---> RNA polymerase III transcription pathway chromatin modification/remodeling pathway ---> RNA polymerase I transcription pathway RNA polymerase II transcription pathway ---> ncRNA transcription pre-rRNA transcription pre-tRNA transcription RNA polymerase I transcription pathway ---> pre-rRNA transcription RNA polymerase III transcription pathway ---> pre-tRNA transcription RNA polymerase III transcription pathway ---> small ncRNA transcription small ncRNA transcription ncRNA transcription