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03/23/10 7:30 PM ET

Rockies prospect Belen suspended

Fifty-game penalty effective at beginning of season

The Commissioner's Office announced Tuesday that Colorado pitching prospect Jose Belen has received a 50-game suspension for violating the Minor League Drug Prevention and Treatment Program.

Belen, a member of Colorado's entry in the Dominican Summer League, tested positive for metabolites of Methandienone, a performance-enhancing substitute. The right-hander's suspension will be effective at the start of the 2010 season.

Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.