The Why Files Staff:
Terry Devitt
editor

Sarah Goforth
project assistant

S.V. Medaris
designer/illustrator

Darrell Schulte
webmaster

David Tenenbaum
feature writer

Amy Toburen
content development
executive

Credits:

Malcolm Alison
professor of experimental pathology
Imperial College London

Diane Krause
department of laboratory medicine
Yale University School of Medicine

*James Thomson
department of anatomy
University of Wisconsin-Madison.

*denotes fact-checker

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