Histology images may be copyrighted and can not be reproduced without permission.
Histology images courtesy of CDC, Dr. Charlotte L. Ownby, Electron Microscopy Facility at The National Cancer
Institute at Frederick (NCI-Frederick), Florida State University, Louisa Howard, Mt.
Hood Community College, NASA, Nivaldo Medeiros, M.D., William A. Olexik,
Wikimedia Commons and user User CS99.