Expression of two Xenopus laevis ribosomal protein genes in injected frog oocytes

The expression of two Xenopus laevis ribosomal protein genes (L1 and L14) has
been analysed by microinjection of the cloned genomic sequences into frog oocyte nuclei.
While the injection of the L14 gene causes the accumulation of the corresponding protein in
large excess with respect to that synthesized endogenously, the L1 gene does not. Analysis
of the RNA shows that both genes are actively transcribed. The seven-intron-containing L14
transcript is completely processed to a mature form, while two out of nine intron ...