Saracens returned to winning ways after successive Aviva Premiership defeats with a 29-18 victory over a battling Sale.
Stuart Barnes on a great Sunday for the Premiership's northern clubs and concerns for Test rugby in the southern hemisphere.
Saracens lost 31-23 to Gloucester at Kingsholm despite England prop Mako Vunipola's return from injury.
Ryan Mills kicked eight penalties as Aviva Premiership champions Saracens crashed to a shock 24-18 defeat at Sixways.
Saracens have signed Samoan lock Fa'atiga Lemalu on a short-term deal from Japanese Super Rugby side Sunwolves.
George Kruis will miss the rest of the Six Nations after it was confirmed the England lock will have surgery on a knee injury.
Saracens, Leicester Tigers and Exeter Chiefs all clinched places in the Anglo-Welsh Cup semi-finals on Sunday.
England forward George Kruis will see a second specialist to determine the full extent of his knee injury.
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