After encountering support just over 100-26, MBS 4.5's rose to 100-29 alleviating some previous risk of a reprice for the worse.  But moments ago, losses superseded those previous lows by about a quarter of a tick, bringing MBS back into a range that could elicit reprices for the worse. 

With the 10yr yield seeming to form a double top at 3.70, it's still possible that many lenders will not reprice for the worse given the already discussed factors of it being late in the day on a Friday, but more so than last post, the risks have increased for reprices to be more than merely isolated incidents.  Act accordingly, but know that if next week's bond auctions are strong, we could be right back in the mix.