The Detroit Pistons signing of Justin Harper from the NBA Development League's Los Angeles D-Fenders is the 21st GATORADE Call-Up of the 2015-16 season.

The NBA Development League, the NBA's official minor league, streams over 400 live games on the NBA D-League YouTube Channel and NBADLeague.com. Fans can get a glimpse at the players, coaches and officials competing to ascend to the NBA's rank. With 30 percent of players on start-of-season NBA rosters boasting NBA D-League experience when the 2015-16 season tipped off in October, the NBA D-League YouTube Channel is the best place to see the future now.

The NBA D-League consists of 19 teams for the 2015-16 season, all singly affiliated with an NBA franchise: Austin Spurs (San Antonio Spurs), Bakersfield Jam (Phoenix Suns), Canton Charge (Cleveland Cavaliers), Delaware 87ers (Philadelphia 76ers), Erie BayHawks (Orlando Magic), Fort Wayne Mad Ants (Indiana Pacers), Grand Rapids Drive (Detroit Pistons), Idaho Stampede (Utah Jazz), Iowa Energy (Memphis Grizzlies), Los Angeles D-Fenders (Los Angeles Lakers), Maine Red Claws (Boston Celtics), Oklahoma City Blue (Oklahoma City Thunder), Raptors 905 (Toronto Raptors), Reno Bighorns (Sacramento Kings), Rio Grande Valley Vipers (Houston Rockets), Sioux Falls Skyforce (Miami Heat), Santa Cruz Warriors (Golden State Warriors), Texas Legends (Dallas Mavericks) and Westchester Knicks (New York Knicks).

Three more NBA franchises have purchased one-to-one affiliates for the 2016-17 season: the Brooklyn Nets, Charlotte Hornets and Chicago Bulls.

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