After "faking" like they were going to bounce back a bit, MBS are back at the lows for the close.

4.5's are at 101-10 and 5.0's at 101-28.  So that would be 5.0's hurting a bit more than 4.5's compared to where they were.

It's not out of the realm of possibility to see another slight reprice for the worse now.