derives_from primary_transcript transcript precursor_RNA precursor RNA sequence Any RNA species that is not yet the mature RNA product; may include ncRNA, rRNA, tRNA, 5' untranslated region (5'UTR), coding sequences (CDS, exon), intervening sequences (intron) and 3' untranslated region (3'UTR). Evan Christensen This term should be used for RNA which may be the result of post-transcriptional processing; if the RNA in question is known not to have been processed, use primary_transcript (SO:0000185). At the time this SO term was created, the INSDC Feature Table has a specific term (i.e. precursor_RNA) for transcripts that may be in various stages of processing between primary_transcript (SO:0000185) and mature_transcript (SO:0000233). See the INSDC Feature Table Definition for the "precursor_RNA" feature key https://www.insdc.org/submitting-standards/feature-table/. Added 9 Sep 2025 at the request of Terence Murphy of NCBI to support transformation between the INSDC Feature Table and GFF3 formats. See GitHub Issue #655. INSDC_feature:precursor_RNA 2025-09-09T19:26:13Z SO:0002393