Ireland hooker Rory Best has signed a new contract which keeps him at Ulster for the next two years.
Leinster and Ulster will attempt to put their Champions Cup disappointment behind them when they meet at the RDS on Friday.
Chris Fusaro and Ryan Grant will make their 100th Glasgow Warriors appearances when they host Benetton Treviso on Friday.
Edinburgh coach Alan Solomons has made five changes to his starting XV for Friday's visit of the Dragons to Murrayfield.
Ireland international scrum-half Kieran Marmion has signed a new two-year contract with Connacht.
Glasgow hooker Pat MacArthur has been ruled out for around six weeks after suffering a broken jaw against Northampton.
Aaron Shingler has committed his future to the Scarlets until at least the end of the 2016-17 season.
Gregor Townsend has confirmed the Glasgow Warriors players are all safe and well following the terror attacks in Paris.
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