50 Cent is doing his part to help fight leukemia -- by letting fans watch him go through the actual registration process to become a bone marrow donor.

50 Cent Leukemia

50 shot a PSA for DKMS last week, showing the simple steps one can take to do a lot of good for someone in need -- and urging his fans to "get swabbed."

You can learn more about becoming a donor at dkmsamericas.org.

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