Arsenal's title challenge suffered a blow as their late rally was only enough to secure a 2-2 draw at West Brom.
Albion were 2-0 up just before the hour mark when Peter Odemwingie capitalised on a mistake by Manuel Almunia to add to Steven Reid's early header.
The Gunners staged a comeback with goals in the 70th and 78th minutes from Andrey Arshavin and Robin van Persie, but they could not find a winner and are now five points behind Barclays Premier League leaders Manchester United, who beat Bolton 1-0.
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