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Melatonin is a hormone, released primarily by the pineal gland, that regulates the sleep–wake cycle. 3D ball-and-stick model, white background

Close-up shot of a petri dish for checking an antibiotic in the laboratory.

Folic acid, folate molecule. It is known as vitamin B9. Molecular model. 3D rendering. Illustration

Molecular model of amylose, one of the two sugar components in starch.

Squalane is a hydrocarbon derived by hydrogenation of squalene. 3d illustration

A model of a molecule of Glycine, an amino acid. Amino acids are the building blocks of proteins and have many functions in metabolism.

Copper(II) sulfate with molecular structure. Chemical ingredient used in medical and public health issues.

The petri dish and liquid is used to work with human cells. Laboratory work in the clinic for artificial fertilization of a female egg.

Prednisone is a glucocorticoid medication mostly used to suppress the immune system and decrease inflammation in conditions such as asthma, COPD, and rheumatologic diseases.

3d Rendering Molecular Structure,Ozone,Hydrogen and oxygen

DNA mutation, a mutation is a change in a DNA sequence, mutations can result from DNA copying mistakes made during cell division.

Chemical molecular formula hormone testosterone. Infographics illustration. 3D rendering

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Hyaluronan, hyaluronic acid, HA, hyaluronate molecule, short fragment. Molecular model. 3D rendering. Illustration

Microcrystalline wax with chemical formula on white laboratory table.

Tryptophan or Trp is an alpha-amino acid that is used in the biosynthesis of proteins, 3d illustration

Decitabine is a medication for the treatment of myelodysplastic syndromes, a class of conditions where certain blood cells are dysfunctional.

Rendered Remdesivir molecule in 3D, an experimental drug from Gilead, used to cure the first case of 2019-nCoV in the United States (for a patient at Seattle, Washington). The model showed accurate atom connection and stereochemistry, which was professionally checked. Color symbols - light blue=carbon, red=oxygen, blue=nitrogen, white=hydrogen, green=phosphorus

Sildenafil molecule. It is drug for the treatment of erectile dysfunction. Molecular model. 3D rendering. Illustration

Backgrounds of Characteristics of Bacteria and Fungi for education in Microbiology laboratory.

Molecular model of Adenosine triphosphate, or Adenosine-5'-triphosphate (ATP)

Prostaglandin D2 or PGD2 is a prostaglandin that binds to the receptor PTGDR as well as CRTH2. 3d illustration

Glutathione (GSH) is an antioxidant in plants, animals, fungi, and some bacteria and archaea. White background

Chain or ribbon diatom, a type of algae.

Free Images: "bestof:NGPBenzylExample.gif en Non-neighbouring group participation example for chemical glycosylation reactions Own Pktrisacch 2009-04-13 Check categories 2009 June"

Sunset seen from Arctic View in Finmark - Norway.jpg

Standing Paddleboarders and Rowers in Upper Newport Bay (Newport Beach, California).jpg

Chernabura island Shumagin island group.jpg

People in small discussion group meeting.jpg

Group of people enjoying a canoe tour.jpg

Group of girl scouts enjoys birdwatching.jpg

Happy group of children playing race.jpg

Group of people look through binoculars.jpg

People working in small group in office.jpg

Chiswell island group gulf of Alaska.jpg

Group of children watching as snow falls.jpg

Group of teens practice their archery skills.jpg

This is an example of a logging method known as clear cuttin.jpg

Man shows a group of teens a strip of wood.jpg

Group of blow flies congregating on a sign post.jpg

Group of adults and children enjoy recreational fishing.jpg

Older person shows how a watershed works to a group of school children.jpg

People seated at table participating in group discussion during meeting.jpg

Group of walrus animals crammed side by side.jpg

Group of environmental education science teachers take the tour by canoe on lake.jpg

Rathong glacier from Dzongri La (pass) 1.jpg

High Level Bridge Edmonton Alberta Canada 01 A.jpg

Gfp-iowa-bellevue-state-park-steps-on-the-hiking-trail.jpg

Gfp-florida-biscayne-national-park-island-from-the-shore.jpg

Gfp-canada-ontario-scenery-at-thousand-islands-bridge.jpg