Geneticists initially treated so-called "junk DNA"—stretches of the genome that do not code for proteins—as evolutionary leftovers without biological function. ______ , advances in genomic technology have revealed that many of these regions play important regulatory roles in gene expression.
Which choice completes the text with the most logical transition?
- A
For instance
- B
Indeed
- Ccheck_circle
However
- D
Therefore
Explanation
New evidence overturns the initial assumption. "However" signals contrast. The others do not.