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SAN FRANCISCO, CA - CIRCA 2011: In this handout image provided by the NFL, Colin Kaepernick of the San Francisco 49ers poses for his NFL headshot circa 2011 in San Francisco, California. (Photo by NFL via Getty Images)

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Photos: Colin Kaepernick through the years

Photos: Colin Kaepernick through the years

Colin Kaepernick face of Nike’s 30th anniversary ‘Just Do It’ ad campaign

WATCH: Colin Kaepernick stars in Nike's 'Just Do It' 30th anniversary commercial...

Nike ad campaign featuring Colin Kaepernick sparks boycott

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