After being up more than 3/8ths of a point on the day, MBS are now up only a quarter point and down 5 ticks (.16) from the AM highs. Because those highs occurred around the same time many lenders publish rates for the day, negative reprices are a possibility for the jumpier lenders.
10yr yields are still down 9.3bps on the day at 4.301, but they were as low at 4.26 an hour ago.