Blaine Gabbert made his first start for the 49ers against the Falcons on Sunday, and played very well subbing for beleaguered starter Colin Kaepernick.
But in the fourth quarter, a hit to the head by Falcons linebacker Philip Wheeler forced Gabbert to leave the game and be evaluated for a concussion.
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Kaepernick came in for just three plays -- two runs and an incomplete pass. The crowd reaction?
A chorus of boos for Kaepernick when he entered and left the game.