ST. PETERSBURG, Fla. — Nolan Revels passes time in his football-themed hospital room playing football video games.

The 10-year-old's older brother, Reed, is also a sports fan, practicing his throw with a target toss game in the room.

“They're their own team, really. It's very cool to watch,” said their mother, Megan Revels.

What You Need To Know • Nolan Revels, 10, has a rare genetic mutation for bone marrow cancer • His brother, Reed, was first diagnosed with the cancer and went through chemotherapy and had a bone marrow transplant • Johns Hopkins All Childrens Hospital performed a preemptive bone marrow transplant on Nolan before he developed leukemia, which was a first for the hospital • The brothers are helping each other navigate their health battles

The brothers are on a

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