San Francisco 49ers quarterback Colin Kaepernick throws the ball during NFL football practice, Thursday, May 21, 2015, in Santa Clara, Calif. (AP Photo/George Nikitin)

SANTA CLARA, Calif. (AP) — 49ers quarterback Colin Kaepernick has apologized for a post on social media Tuesday that referenced flood-ravaged Houston, where San Francisco opens the preseason Aug. 15.

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