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Spike glycoprotein homotrimer, a main target for neutralization antibody, to bind its receptor, ACE2, and mediate membrane fusion and virus entry. 3D cartoon and Gaussian surface models, white background.
The three-dimensional structure of proteins is represented in a variety of conformations. This image is based on the ribbon structure of a protein. It is suitable for biology notebooks and book covers.\nThis image has not been created by AI.
Bacterial multidrug efflux pumps (E-CmeB) expel antibiotics  from inside the bacterium (bottom): ciprofloxacin (yellow), chloramphenicol (violet),  ampicillin (red).
Dna structure digital concept
RNA And DNA concept as a deoxyribonucleic acid or a ribonucleic acid as biological molecules as a symbol of the evolution of life and genetic sequencing.
Photomicrograph of filamentous blue-green algae, Oscillatoria species. Each band along the stand is one cell. This filament is very short probably having recently parted from a longer one. Filaments are typically many times longer. This algae is mobile, it moves and twists through the water. San Francisco Bay, California, USA. Live specimen. Wet mount, 40X objective, transmitted brightfield illumination. Note - motion blur of live specimen, very shallow depth of field, chromatic aberration and uneven focus are inherent in light microscopy.
DNA or Deoxyribonucleic acid is a double helix chains structure formed by base pairs attached to a sugar phosphate backbone.
Molecular Model of Human Insulin with disulfide bonds shown.
3D cartoon and Gaussian surface models, PDB 4cmh, white background
DNA and biotechnology concept
The calcitonin gene related peptide (yellow) binds to its receptor (blue) on neurons and smooth muscle cells of cerebral blood vessels, activating a signal cascade through G-proteins (dark blue) in this cells that  leads to a dilatation of the blood vessels (vasodilatation).
plant Leaf of Nerium indicum T.S. under light mircoscope with white background
The crystal structure of the tumor marker protein. The 3D model of the biological macromolecule.
In vitro bacterial culture
Artificial cyber DNA strand. 3D illustration
Futuristic artificial DNA strand among organic models. Medical innovation and technology concept.
Proliferating cell nuclear antigen (PCNA) is a DNA clamp that acts as a processivity factor for DNA polymerase δ in eukaryotic cells and is essential for replication. PCNA is a homotrimer and achieves its processivity by encircling the DNA, where it acts as a scaffold to recruit proteins involved in DNA replication, DNA repair, chromatin remodeling and epigenetics. 3D cartoon and Gaussian surface models, chain instance color scheme, based on PDB 3wgw, white background.
3D rendering of microscopic particles and bubbles
HER2 (light blue)  locked in the inactive conformation by Trastuzumab (left) and Pertuzumab. Trastuzumab has drastically improved the prognosis of HER2-positive breast cancer patients.
DNA A-T Pair
DNA molecule spiral structure model isolated on white background, chromosome and gene chemical science biology.
A ball and stick model of a Polytetrafluoroethylene molecule, also known as PTFE or most commonly Teflon. It is a polymer consisting of only carbon and fluorine atoms. It is used as a non-stick coating for cookware, as a lubricant, and it is also used to contain highly reactive chemicals as it is extremely non-reactive.
A fixed preparation of yeast and hyphae stained with gentian violet that buds under a microscope with immersion
Blastomycosis is a fungal infection caused by inhaling Blastomyces dermatitidis spores. If it involves only the lungs, it is called pulmonary blastomycosis. Only about half of people with the disease have symptoms, which can include fever, cough, night sweats, muscle pains, weight loss, chest pain, and feeling tired.
3D cartoon and Gaussian surface models, chain id color scheme, PDB 7t3a, white background
Liver Fluke Section under light microscope with white background
From left to right: the NMDA and  AMPA receptors transport calcium cations into neurons after being activated by the neurotransmitter glutamate and  the GABA receptor (right) transport chloride anions after the activation by gamma aminobutyrate. PDB entries: 6wht,  3kg2, 6d6u
3d render of abstract connection background
Algaes under microscopic view
What micro plastic is made of - Chemical ingredients.\nClose up of microplastic on finger concept of water pollution and global warming
Free Images: "bestof:PDHE1 1NI4.png en ribbon model of pyruvate dehydrogenase subunit E1 PDHE1 of PDH tetramer with thiamin diphosphate as balls from PDB 1NI4 Ref E M Ciszak et al"
Insula Maioricae Vicentius Mut 1683.jpg
Medusozoan phylogeny.svg
Marrellomorpha distribution light.svg
Endsley-SA-model.svg
Number of snake envenomings.svg
HebbianYerkesDodson.svg
Ganymede magnetic field.svg
Biological classification L Pengo.svg
Biological classification L Pengo tweaked.svg
Hendrick_Goltzius_-_Jupiter_en_Antiope.jpg
World distribution of snakes.svg
Biological classification S Pengo.svg
OriginalYerkesDodson.svg
Fortvivlan.jpg
Omega_Baryon.svg
Standard Model of Elementary Particles.svg
'Le voeu du faisan' Rijksmuseum SK-A-4212.jpeg
Effects of sleep deprivation.svg
Hendrick_ter_Brugghen_-_Bagpipe_Player_-_Google_Art_Project.jpg
Notable mutations.svg
Libyan Uprising-sr.svg
Distribution of Hygrophorus cossus.svg
Gerard_van_Honthorst_007.jpeg
John_Paul_Jones_by_Charles_Wilson_Peale,_c1781.jpg
PDHE1 1NI4.png
Pyruvate-decarboxylase-1PVD.jpeg
Sorbitol dehydrogenase 1PL8.png
OGDH-Ecoli-2JGD.png
PDB 1ni4 EBI.jpg
Malate dehydrogenase (Sus) 4MDH.png
Aldolase-A 1ALD.jpg
Fructose 1,6-bisphosphatase 1FTA.png
GCL Ecoli 1V4G.png
PDC-tetramer-2VK1.jpg
ALAT2-3IJH.jpg
Shiga toxin B 1DM0.png
Glucokinase 3F9M.png
CYP450-51A1 3LD6.jpeg
MGMT+DNA 1T38.png
Helicase EIF4A1+PDCD4 2ZU6.png
Anthrax-toxin-edema-factor+calmodulin 1XVF.png
Citrate-synthase Acetobacter 2H12.png
GAPDH 1U8F.jpg
PDB 1ik6 EBI.jpg
PDB 2ozl EBI.jpg
Fumarase 3e04.png
Renin 2REN.png
Kallikrein-1 1SPJ.png
Catalase 1DGF.png
PEPCK 1KHF.png
Endostatin 1BNL.png
Ovalbumin 1OVA.png
Factor XI 2F83.png
Antitrypsin 1HP7.png
Amyloid-beta-42 1IYT.png
Asparaginase2 Ecoli 3ECA.png
GCH1-decamer 1FB1.png
Connexin-Cx26 2ZW3.png
Glutathionperoxidase 2F8A.png
TNFB+TNFR 1TNR.png
Allergen Betv1A 1QMR.jpg
CXCL12 1A15.png
Pepsin+Pepstatin 1PSO.png
SCOT 3DLX.png
Ketohexokinase 3NBW.png
Interleukin-21-2OQP.png
Urease 2KAU.png
CD4+MHCII 1JL4.png
Glucuronidase 1BHG.png
ASAT 1AJS.png
Coagulation factor XIII 1EVU.png
Anthrax-lethal-factor 1J7N.png
SODC 2C9U.png
CETP 2odb.png
BAX protein 2K7W.png
GM-CSF+receptor 3cxe.png
PA-83 1ACC.png
Kynureninase-3E9K.png
Phytase 1IHP.png
PFKFB1 1K6M.png
ApoA1+lipids 3K2S.png
G6PI 1JIQ.png
Hem-hap 4f4o.jpg
Adenylate kinase 2C95.png
Thermolysin 2A7G.png
Thermolysin detail 2A7G.png
BDNF 1BND.jpg
PDB 2iea EBI.jpg
PDB 1l8a EBI.jpg
PDB 2g28 EBI.jpg
PDB 2g25 EBI.jpg
PDB 1rp7 EBI.jpg
PDB 2g67 EBI.jpg
PDB 2qta EBI.png
PDB 2qtc EBI.png
Diphosphomevalonate dicarboxylase 3D4J.png
Leghemoglobin 1FSL.png
GGPP-synthase 2Q80.png
Primase 3B39.png
Lysozyme 1LZ1.png
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