
SEM_blood_cells: By Bruce Wetzel (photographer). Harry Schaefer (photographer) (Image and description: National Cancer Institute) [Public domain], via Wikimedia Commons

Macs_killing_cancer_cell: By Susan Arnold (photographer) [Public domain], via Wikimedia Commons

Cancer_cells: By Dr. Cecil Fox (Photographer) [Public domain or Public domain], via Wikimedia Commons

Yersinia_pestis_Bacteria: By National Institutes of Health (NIH) (National Institutes of Health (NIH)) [Public domain], via Wikimedia Commons

Cho_cells_adherend1: By User: Alcibiades (Self-made during work) [Public domain], via Wikimedia Commons

Legionella_pneumophila_(SEM)_2: By Janice Haney Carr; provided by CDC/ Margaret Williams, PhD; Claressa Lucas, PhD;Tatiana Travis, BS [Public domain], via Wikimedia Commons

Hospital-associated_Methicillin-resistant_Staphylococcus_aureus_(MRSA)_Bacteria: By NIAID/NIH (NIAID Flickr's photostream) [Public domain], via Wikimedia Commons

Chlamydomonas_TEM_07: By Dartmouth Electron Microscope Facility, Dartmouth College [Public domain], via Wikimedia Commons

Ebola_Virus_TEM_PHIL_1832_lores: By Photo Credit: Cynthia Goldsmith Content Providers(s): CDC/ Cynthia Goldsmith [Public domain], via Wikimedia Commons

Colorized_transmission_electron_micrograph_of_Avian_influenza_A_H5N1_viruses: By Photo Credit: Cynthia Goldsmith Content Providers: CDC/ Courtesy of Cynthia Goldsmith; Jacqueline Katz; Sherif R. Zaki [Public domain], via Wikimedia Commons

Stichotricha_secunda_-_400x_-_Macronuclei_(14994677881): By Picturepest (Stichotricha secunda - 400x - Macronuclei) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons

CSIRO_ScienceImage_1477_Protein_Crystals: CSIRO [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons

Uroleptus_piscis_-_400x_-_175µ_(10003400483): By Picturepest (Uroleptus piscis - 400x - 175µ) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons

Stichotricha_aculeata_(7704080866): By Picturepest (Stichotricha aculeata) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons