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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

Bacterial multidrug efflux pumps (E-CmeB) expel antibiotics from inside the bacterium (bottom): ciprofloxacin (yellow), chloramphenicol (violet), ampicillin (red).

Microcrystalline wax with chemical formula on white laboratory table.

A ball and stick model of Dopamine. It is a neurotransmitter affecting behaviour, sleep, learning, perception of pain, mood and motivation.

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

An ECG test chart with pills and a stethoscope

3D Caffeine Molecule Made From Coffee Beans Illustration Isolated on Black and White Background With Clipping Path. Caffeine is a Drug That Stimulates the Activity of Your Brain and Nervous System by Blocking the Action of Adenosine.

Handwriting Chemical formula of Citric Acid with pen. Close up.

3d Rendering Molecular Structure,Ozone,Hydrogen and oxygen

3D cartoon and Gaussian surface models. chain id color scheme, PDB 5zjd, white background.

Halofantrine is a drug used to treat malaria. Halofantrine's structure contains a substituted phenanthrene, and is related to the antimalarial drugs quinine and lumefantrine. 3d illustration

Abstract technological design of an artificial molecular structure in many colors. Horizontal wide composition.

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

A molecular model of the flavonoid Quercetin. An antioxidant and anti-inflamatory, it is used as a nutritional suplement. It is commonly found in many fruits and vegetables and is a significant chemical component of tea. Isolated on white.

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

Molecular structure of Sulfur dioxide SO2

Chemical formula of Progesterone. Close-up.

Hormone Oxytocin biochemical concept background

Microcrystalline wax with chemical formula on white laboratory table. Top view

A molecular model of Bisphenol A or BPA. It is a common building block in the production of many epoxy resins and plastics including polycarbonate plastic. As such it is present in a huge range of food packaging and household products. There are now concerns about its health effects, particularly its effect on children, infants and fetuses. Isolated on white.

PETase (left) degrades polyethylene terephtalate (PET) into monohydroxyethyl terephthalate (MHET) and MHETase degrades MHET ethylene glycol (EG) and terephthalic acid (TPA). The substrates in the binding sites are depicted in red.

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

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N-Cyclohexyl-2-aminoethanesulfonic acid.svg

Pancuronium–acetylcholine comparison.svg