9. Eukaryotic primary transcripts are usually composed of (1) 5'-UTR, (2) Exon, (3) Intron, and (4) 3'- UTR, but their full length cDNAs only contain
(A) 1+2+3,
(B) 2,
(C) 1+2+4,
(D) 2+3,
(E) 1+2+3+4

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