The Bodies exhibit at South Street Seaport hosted a bone marrow drive for Mark Ezra Fineman's 3rd birthday on Sunday.
Fineman suffers from a rare immune deficiency that makes his body unable to properly fight off infections.
The only cure is a bone marrow or stem cell transplant.
Visitors to the exhibit could simply swab their cheeks to determine whether they're a match for Fineman.
People who participated in the drive were added to a registry to also see if they're a match for other patients around the world.
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