I want to know the answer to the following question:
Who searched for specifically Slavic sub-group of R1a1a [M17]?
All the background I'm provided with is that "The team led by Peter Underhill, which discovered M458, did not consider the possibility that this was a Slavic marker, since they used the "evolutionary effective" mutation rate, which gave a date far too old to be Slavic.". Is that enough to answer the question?
Answer: no