def rna(dna):
    rna = dna.replace("T", "U")
    return rna
d67f730a8e939c3429806c03549e33ae66b6e99a
<mask token>

def rna(dna):
    rna = dna.replace('T', 'U')
    return rna

def rna(dna):
    rna = dna.replace("T", "U")
    return rna