Article Photos: Thunder notebook: Kendrick Perkins, Tony Allen have unpleasant exchange 3/77

Darrell Arthur (00) of Memphis takes the ball from Oklahoma City's James Harden (13) in the first half during game one of the Western Conference semifinals between the Memphis Grizzlies and the Oklahoma City Thunder in the NBA basketball playoffs at Oklahoma City Arena in Oklahoma City, Sunday, May 1, 2011. Photo by Nate Billings, The Oklahoman