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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

3d rendering of benzene molecules conjugated gold (Au) nanoparticles (NPs) on the black background

A molecular model of the plasticizer Dibutyl Phthalate or DBP. As a plasticizer it has been used in many products including adhesives, textiles, cosmetics and children's toys. There are now concerns about its health effects, particularly its effect on male health and behaviour. Isolated on white.

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

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

Calcidiol molecule, also called calcifediol, major circulating metabolite of vitamin D3 produced in liver, 3D illustration

B-chain pentamer and A-chain subunit (green), 3D cartoon and Gaussian surface model, white background

plant Pumpkin ovary under light mircoscope with white background

Glucosamine (C6H13NO5) is an amino sugar. treatment for osteoarthritis. Chemical structure model: Ball and Stick + Balls + Space-Filling. 3D illustration.

Urothelial carcinoma, high grade. High-grade tumors have an aggressive appearance under a microscope and are assumed invasive in the kidney or ureter.

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

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

Molecular model of insulin hormone, 3D illustration. It is produced by pancreas and takes part in glucose and lipid metabolism

3D cartoon and Gaussian surface models, PDB 3hg3, white background

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.

Potassium Chromate powder in Chemical Watch Glass with molecular structure.

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.

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

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Cytochrome P450 molecule. CYP 3A4 is the most promiscuous of the human CYP enzymes. Molecular model. 3D rendering. Illustration

Bone marrow plasma cells .Plasma cell neoplasms are diseases in which the body makes too many plasma cells. Plasma cell neoplasms can be benign or malignant. Diagnosed with Immunostain CD138 positive.

3D cartoon and Gaussian surface models, chain id color scheme, PDB 2y73, white background

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

The main hormones produced by the thyroid gland are thyroxine or tetraiodothyronine or T4 and triiodothyronine or T3 3d rendering

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