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The LDL-receptor (red) is a membrane protein found in almost every human cell. It binds to the apoprotein B100 from LDL-particles and mediates their internalization (endocytosis) in the cell. This occurs in almost all cells but mainly in the liver where it removes about 70 % of LDL from the circulation.

$The three-dimensional structure of proteins is represented in a variety of conformations. This image is based on the ribbon structure of a protein. It is suitable for biology notebooks and book covers.\nThis image has not been created by AI.$

3D cartoon and Gaussian surface models, chain id color scheme, PDB 7t3a, white background

Models of an antibody broadly antagonistic to HIV. A challenge in AIDS and HIV research is producing a vaccine which elicits antibodies effective against the many variations of HIV proteins.Isolated on white.

Nucleosome structure. Structure of an oligonucleosome, showing the packaging of DNA in chromosomes. 3D illustration.

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.

Endosomes - 3d rendered image of Endosomes are membrane-bound organelles. They are parts of endocytic membrane transport pathway. Endomembrane system in cells. Bilayer Lipid Membrane. Abstract medical illustration. Microscopic view. Microbiologic research concept.

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

Focal nodular hyperplasia (FNH) is a benign liver lesion that is composed of a proliferation of hyperplastic hepatocytes surrounding a central stellate scar. Typically, FNH is a solitary lesion that is more commonly seen in women.

Deacetoxycephalosporin-C synthase (DAOCS) is a mononuclear ferrous enzyme that transforms penicillins into cephalosporins. 3D cartoon and Gaussian surface models, chain instance color scheme, based on PDB 1uof, white background.

DNA close-up, DNA Molecule Model, DNA Strands, DNA animation

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

GABA B receptors are G protein-coupled receptors, also called metabotropic receptors. Binding of an agonist (baclofen, red) leads to a G-protein coupled C-AMP signaling pathway. Source: PDB entries 7eb2, 6r3q,.

anaplastic thyroid carcinoma with heterologous differentiation (leiomyosarcoma)

3D cartoon and Gaussian surface models, PDB 1j7n, chain id color scheme, white background

Photomicrograph of rotifer. Rapidly rotating cilia at top of head, internal organs visible. Live specimen. Wet mount, 40X objective, transmitted brightfield illumination.

Dna structure on science background. 3d illustration

Proteasomes are molecular machines for breaking down proteins called proteolysis, only target proteins that have been marked for destruction called ubiquitin to the target protein, 3d rendering

$Abs Virus - 3d rendered image like colorized scanning electron micrograph. Scene showing virus (yellow) emerging from infected cell.\nConcept of coronavirus that’s causing a global pandemic. Covid-19, Sars-cov-2 alpha, betta, gamma, delta, lambda variant, 2019-nCoV, Coronavirus.\nSEM, TEM, hologram view.$

orange: RNA primer; red: RNA template; light blue: proofreading riboexonuclease; mid blue: helicase; dark blue: RNA directed RNA polymerase; violet: non structural proteins (NSPs).

Myxoid liposarcoma. Myxoid/round cell liposarcoma, or MRCLS, is one of several types of liposarcoma. Liposarcoma is a rare cancer that grows in the cells that store fat in the body. MRCLS usually grows in the arms and legs. These tumors grow slowly, and they can spread to other parts of the body

The model shows the 30S ribosome RNA (blue), three tRNA (top), and ribosomal proteins. 3D Gaussian surface model, white background

plant Leaf of Mentha Haplocalyx T.S. under light mircoscope with white background

Intracellular transport, kinesin motor proteins, orange, transport molecules moving across microtubules, 3D illustration

Computer generated abstract concept image of 3d spheres like metaphor of abstract business processes.

Free Images: "bestof:PDB 2b8t EBI.jpg Small proteins Glucocorticoid receptor-like DNA-binding domain Glucocorticoid receptor-like DNA-binding domain Type II thymidine kinase zinc"

Melissodes_subillata,_f,_back,_velum,_Dorchester_Co,_MD_2015-12-09-12.47.jpg

Melissodes_subillata,_f,_face,_velum,_Dorchester_Co,_MD_2015-12-09-13.14.jpg

Melissodes_subillata,_f,_side,_velum,_Dorchester_Co,_MD_2015-12-09-13.41.jpg

Coelidiana_undata,_m,_brazil_2016-02-23-11.57.jpg

Milburn_Carrier_2.Cement_Carrier._FZ200.jpg

Andrena_nubecula,_F,_Face_ammonia,_MD,_Anne_Arundel_County_2014-02-21-17.13.59_ZS_PMax.jpg

Hypanthidioides_arenaria,_f,_face,_brazil_2014-08-06-06.12.01_ZS_PMax.jpg

Coelioxoides_waltheriae,_f,_peru,_side_2014-08-09-11.10.33_ZS_PMax.jpg

Rophitulus_species,_angle,_brazil_2014-08-06-09.51.24_ZS_PMax.jpg

Rophitulus_species,_face,_brazil_2014-08-06-10.08.10_ZS_PMax.jpg

centepede_2015-04-16-09.57.17_ZS_PMax.jpg

Coelioxoides_waltheriae,_f,_peru,_face_2014-08-09-10.59.51_ZS_PMax.jpg

Perdita_bishoppi,_female,_back_2012-07-09-19.45.jpg

Perdita_bishoppi,_female,_side_2012-07-09-20.02.jpg

Hypanthidioides_arenaria,_f,_back,_brazil_2014-08-05-22.39.13_ZS_PMax.jpg

Ochreriades_fasciata,_m,_face,_israel_2014-08-06-08.44.07_ZS_PMax.jpg

Ochreriades_fasciata,_m,_side,_israel_2014-08-06-08.52.49_ZS_PMax.jpg

Rophitulus_species,_side,_brazil_2014-08-06-10.20.38_ZS_PMax.jpg

Lasioglossum_heterorhinum,_F,_Face,_UT,_Garfield_County_2014-05-09-17.50.19_ZS_PMax.jpg

Heriades_leavitti,_male,_underside_abdomen_2012-07-06-18.10.jpg

Andrena_arabis,_M,_Face,_NY,_Orange_Co_2013-06-07-17.49.58_ZS_PMax.jpg

Lasioglossum_glabriventre,_F,_Face1,_WY,_Lincoln_County_2014-06-20-16.15.37_ZS_PMax.jpg

Sap_Beetle_2015-04-13-21.55.11_ZS_PMax.jpg

$Heriades_leavitti,_male,_side_2012-07-06-17.56.jpg$

Coelioxoides_waltheriae,_f,_peru,_angle_2014-08-09-10.50.32_ZS_PMax.jpg

Nomada_tiftonensis,_m,_back,_Minnesota_2016-04-19-13.46.jpg

Nomada_tiftonensis,_m,_side,_Minnesota_2016-04-19-14.10.jpg

Prenolepis_imparis,_jan_reese,_st_michaels,_md_face_2016-09-09-11.00.jpg

Beetle,_Little_Stsimons_Island,_Georgia,_face_2016-02-03-16.28.jpg

Andrena_robertsonii,_f,_side,_Baltimore_Co,_MD_2016-04-15-19.31.jpg

Beetle2,_Little_Stsimons_Island,_Georgia,_face_2016-02-03-17.04.jpg

Andrena_robertsonii,_f,_back,_Baltimore_Co,_MD_2016-04-15-19.03.jpg

Andrena_robertsonii,_f,_face,_Baltimore_Co,_MD_2016-04-15-19.18.jpg

Lasioglossum_cressonii,_f,_face,_Maine,_Du_Clos_2015-12-01-14.08.jpg

Lasioglossum_cressonii,_f,_back,_Maine,_Du_Clos_2015-12-01-13.50.jpg

Lasioglossum_cressonii,_f,_side,_Maine,_Du_Clos_2015-12-01-14.23.jpg

Lasioglossum_inconditum,_F,_face,_WY,_Lincoln_County_2014-06-17-13.11.22_ZS_PMax.jpg

Lasioglossum_microlepoides,_F,_Face,_AZ,_Pima_County_2015-08-25-11.48.19_ZS_PMax_UDR.jpg

Lasioglossum_microlepoides,_F,_Side,_AZ,_Pima_County_2015-08-25-15.11.45_ZS_PMax_UDR.jpg

Ceratina_rectangulifera,_m,_panama,_side_2014-12-06-16.36.26_ZS_PMax.jpg

Ceratina_rectangulifera,_m,_panama,_back_2014-12-06-16.22.47_ZS_PMax.jpg

Short_tailed_shrew,_M,_Paw,_VA,_Loudon_County_2015-03-24-15.19.47_ZS_PMax.jpg

Ceratina_rectangulifera,_m,_panama,_face_2014-12-06-16.30.10_ZS_PMax.jpg

Meliturgula_haematospila,_back,_f,_south_africa_2014-08-04-19.25.29_ZS_PMax.jpg

bald_faced_hornet,_nest,_beltsville,_pg_county_2014-08-29-17.44.13_ZS_PMax.jpg

Ceratina_arizonensis,_side2,_ca,_santa_barbara_2015-04-20-12.16.53_ZS_PMax.jpg

Ceratina_rectangulifera,_f,_no_pin,_panama,_back_2014-12-06-14.15.14_ZS_PMax.jpg

Ceratina_nr_dentipes,_female,_side_2012-06-13-16.21.jpg

Lasioglossum_seillean,_F,_side,_New_Hampshire,_Coos_County_2015-10-13-13.40.jpg

Bombus_fraternus,_F,_face_2015-01-08-08.44.58_ZS_PMax.jpg

greensand_2015-04-10-21.01.01_ZS_PMax.jpg

fly,_md,_kent,_eastern_neck_nwr,_side_2015-05-25-14.16.43_ZS_PMax.jpg

Nomada_fragariae,_F,_Back,_MD,_PG_County_2015-09-01-15.52.19_ZS_PMax_UDR.jpg

Nomada_fragariae,_F,_Face,_MD,_PG_County_2015-09-01-14.40.10_ZS_PMax_UDR.jpg

Nomada_fragariae,_F,_Side,_MD,_PG_County_2015-09-01-15.06.11_ZS_PMax_UDR.jpg

Perdita_idonea,_female,_side_2012-07-09-20.26.jpg

Perdita_idonea,_female,_face_2012-07-09-20.16.jpg

Ceratina_rectangulifera,_f,_panama,_face_diffuser_2014-12-06-14.21.09_ZS_PMax.jpg

bald_faced_hornet,_nest_5x,_beltsville,_prince_georges_county_2014-08-29-17.33.33_ZS_PMax.jpg

Colletes_validus,_female,_face_2012-04-12-15.30.jpg

Lasioglossum_lineatulum,_female,_top_2012-06-25-15.40.jpg

Halictus_poeyi,_female,_back_2012-07-03-15.34.jpg

Ceratina_nr_dentipes,female,_face_2012-06-13-16.09.jpg

Ceratina_rectangulifera,_f,_panama,_side_2014-12-06-14.33.00_ZS_PMax.jpg

Ceratina_rectangulifera,_f,_panama,_back_2014-12-06-14.15.14_ZS_PMax.jpg

Stenotritus_pubescens,_f,_side,_australia_2014-07-05-12.18.33_ZS_PMax.jpg

stenotritus_pubescens,_f,_back,_australia_2014-07-05-12.32.47_ZS_PMax.jpg

stenotritus_pubescens,_f,_face,_australia_2014-07-05-12.40.14_ZS_PMax.jpg

Bombus_fraternus,_f,_ga,_baker,_back_2015-01-08-08.54.38_ZS_PMax.jpg

Bombus_fraternus,f,_ga,_baker,face_2015-01-08-09.06.56_ZS_PMax.jpg

Bombus_fraternus,_f,_ga,_baker,_side_2015-01-08-08.59.16_ZS_PMax.jpg

Ceratina_zeteki,_m,_panama,_side_2014-12-06-16.54.03_ZS_PMax.jpg

Ceratina_zeteki,_m,_panama,_face_2014-12-06-16.45.56_ZS_PMax.jpg

Ceratina_zeteki,_m,_panama,_back_2014-12-06-16.42.51_ZS_PMax.jpg

Colletes_phaceliae,_f,_back,_Pennington_Co,_South_Dakota_2015-12-01-12.06.jpg

Ceratina_species,_m,_side,_bright_green,_San_Francisco,_CA_2016-05-04-15.56.jpg

Ceratina_species,_m,_head,_bright_green,_San_Francisco,_CA_2016-05-04-15.48.jpg

Colletes_phaceliae,_f,_face,_Pennington_Co,_South_Dakota_2015-12-01-12.23.jpg

Lasioglossum_seillean,_F,_face,_New_Hampshire,_Coos_County_2015-10-15-15.34.jpg

Colletes_phaceliae,_f,_side,_Pennington_Co,_South_Dakota_2015-12-01-12.40.jpg

Hoplitis_simplex,_m,_side,_Charles_Co,_MD_2016-04-15-22.49.jpg

Hoplitis_simplex,_m,_back,_Charles_Co,_MD_2016-04-15-22.29.jpg

Hoplitis_simplex,_m,_face,_Charles_Co,_MD_2016-04-15-22.38.jpg

Nomada_seneciophila,_m,_face,_md,_charles_county_2015-11-20-18.00.jpg

Nomada_tiftonensis,_m,_face,_Minnesota_2016-06-27-17.27.jpg

Nomada_seneciophila,_m,_back,_md,_charles_county_2015-11-20-17.52.jpg

Nomada_seneciophila,_m,_side,_md,_charles_county_2015-11-20-18.12.jpg

Osmia_georgica,_f,_side,_Talbot_Co,_MD_2016-01-13-12.13.jpg

Washed_Megachile,_f,_face,_chile_2014-08-06-10.34.14_ZS_PMax.jpg

$Meliturgula_haematospila,_face,_f,_south_africa_2014-08-04-19.37.13_ZS_PMax.jpg$

Perdita_halictoides,_male,_face_2012-06-18-17.47.jpg

Ceratina_arizonensis,_side,_california,_santa_barbara_2015-04-20-12.12.00_ZS_PMax.jpg

Ceratina_arizonensis,_face,_california,_santa_barbara_2015-04-20-12.06.19_ZS_PMax.jpg

fly,_md,_kent,_eastern_neck,_nwr,face_2015-05-25-14.21.32_ZS_PMax.jpg

Lipotriches_,_f,_australia,_side_2014-11-02-01.05.45_ZS_PMax.jpg

Lipotriches_,_f,_australia,_face_2014-11-02-01.57.03_ZS_PMax.jpg