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An increase the amount of iron inside culture hepatocyte lead to increase amount of ferittin gene products detected by western blotting,bit doesn't change the amount of ferittin gene products detec by northern blotting or by pcr , these results suggest that iron increase the frequency of which of the following ?

The answer is; translation of ferittin mRNA
Why this answer this question from NBME 16 question 33

the western blotting detect the protein, protein = translatio of mRNA

and since there's no change in the amount of the gene product in northern blotting (RNA) .