Post-Transcriptional processing of hnRNA

The primary hnRNA product for chicken ovalabumin  is capped and tailed. The product is then spliced so as to remove segments corresponding to the introns, by joining the segments corresponding to exons (see note 1).  In this example, splicing removes 75% of the original hnRNA sequence (ca. 7700 bp) in 7 intron transcripts (A - G), leaving 7 exon transcripts (1 - 7) in the mature mRNA (1872 bp).

[See this note for an important discussion of terminology]

---

Figure © 2000 by Griffiths et al. ; text © 2026 by Steven M. Carr 

---