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This is likely Jaxson Dart’s “Welcome to the NFL” moment.

On Thursday night during the Giants’ final preseason game against the Patriots, the No. 25 overall pick gave the team a big concussion scare in the first quarter when he was tackled during a 23-yard scramble — and the rookie being pulled from the game for evaluation by medical staff.

He was cleared in concussion protocol and seemingly has vowed to learn his lesson.

“I’ll start sliding more,” the quarterback posted to his Instagram Story late on Thursday — a message that had disappeared from his profile as of Friday morning.

In his first NFL start, Dart seemed to get carri

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