University of Pittsburgh
Department of Ophthalmology
Pittsburgh, Pennsylvania, USA

"Optic nerve head collagen of a pig."

University of Edinburgh
Institute for Immunology and Infection Research
Edinburgh, MidLothian, United Kingdom

"Acute-stage parasites of Toxoplasma gondii in a human skin cell."

Port Townsend, Washington, USA

"Bract (part of the plant's reproductive structures) of a cannabis plant. The bulbous glands are trichomes."

San Anselmo, California, USA

"Seed of a Silene plant."

St. Andrews, Fife, United Kingdom

"Transverse section of rachis (stem) of bracken fern (Pteridium aquilinum)."

Tanta University, Faculty of Science
Department of Zoology
Tanta, Egypt, Arab Republic

"Anterior section of palm weevil."

FP Nature and Landscape Photography
Siracusa, Sicilia, Italy

"Potato tuber sprout."

University of Oxford
Nuffield Department of Clinical Neurosciences (NDCN)
Oxford, Oxfordshire, United Kingdom

"A network of dopaminergic neurons generated from human stem cells."

MDI Biological Laboratory
Murawala Lab
Bar Harbor, Maine, USA

"Ladybug (Coccinellidae) on a clover (Trifolium repens)."

University of Geneva
Department of Genetics and Evolution
Geneva, Switzerland

"Skin scales of a snake embryo stained with Fast Green dye."

Düsseldorf, Germany

"Cross section of a beach grass (Ammophila arenaria) leaf."

San Anselmo, California, USA

"Slime mold (Lamproderma arcyrioides)."

Lions Eye Institute
Physiology and Pharmacology laboratory
Nedlands, Western Australia, Australia

"Abnormal blood vessel formation in a human retina with severe diabetic retinopathy."

Oregon Department of Agriculture (ODA)
Entomology Lab
Albany, Oregon, USA

"Immature male damselfly (Calopteryx aequabilis)."

Medical College of Georgia at Augusta University
Department of Neuroscience & Regenerative Medicine
Augusta, Georgia, USA

"Differentiated mouse brain tumor cells (actin, microtubules, and nuclei)."

Hounslow, Middlesex, United Kingdom

"Brine shrimp."

Beijing Miteyide Culture Co., Ltd.A925
Beijing, China

"Fiber of nylon stockings."

Johns Hopkins University
Department of Biology
Baltimore, Maryland, USA

"Neuronal axons connecting to the muscles of the iris and the cornea."

Woodend, Waimakiriri, New ZealandA936

"Graffiti from Berlin Wall stone section."

Medical University of South Carolina
Department of Regenerative Medicine & Cell Biology
Charleston, South Carolina, USA

"Section of a small intestine of a mouse."

RBM-CNRS
Montpellier, Herault, France

"Tardigrade (Hypsibius exemplaris)."

Charles University
Department of Experimental Plant Biology
Prague, Czech Republic

"Spores of black truffle (Tuber melanosporum)."

Suwalki, Podlaskie, Poland

"Recrystallized mixture of hydroquinone and myoinositol."

Australian National University
Centre for Advanced MicroscopyA306
MacGregor, Australian Capital Territory, Australia

"Autofluorescence in the face of a little two-spotted ladybird (Diomus notescens)."

Club Français de Microscopie
Bailly, France

"Fracture surface of mica (mineral)."

San Anselmo, California, USA

"An insect egg parasitized by a wasp."

Howard Hughes Medical Institute (HHMI), Janelia Research Campus
Ashburn, Virginia, USA

"Floret of a common chicory with pollen grains (spiky balls)."