Gene =5.6 kb 22.2 Nuclear splice junctions 1■2■345l67 are interchangeable but are read in pairs ↓ 1.1kb Figure 22.5 Northern pRimary transcript(5.5 kb blotting of nuclear RNA with an ovomucoid pI robe identifies discrete Lacks introns 5&6 precursors to mRNA. The contents of the more Lacks introns 4.5.6.&7 prominent bands are Contains only intron 3 indicated. Photograph kindly provided by bert OMalley mRNA(1. 1 kb) 消当Figure 22.5 Northern blotting of nuclear RNA with an ovomucoid probe identifies discrete precursors to mRNA. The contents of the more prominent bands are indicated. Photograph kindly provided by Bert O'Malley. 22.2 Nuclear splice junctions are interchangeable but are read in pairs