The yin and yang of this stock has been detailed ad nauseum. The street is a dirty place and a very short DD would produce a staggering mountain of trashy looking news to get thru before the science would reveal itself as worthy of further investigation. And CCR5 is fairly new in the biotech world with plenty of maybe and further investigation required caveats.
If memory serves me right, Dr Yo started a position recently and could have buyers remorse too.