nevertheless , upon increasing b-galactosidase mrna levels , via manipulation of plasmid copy number , a distinct decline in ribosome loading was observed for the heterologous pyk/lacz transcript which was not mirrored by either endogenous pyk transcripts or other yeast mrnas of high ( ribosomal protein 1 ) or moderate ( actin ) codon bias .
C0035696
mrna
C0009221
codon