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    Substantia nigra. Illustration showing a healthy substantia nigra in a human brain. The substantia nigra plays an important role in reward, addiction, and movement. Degeneration of this structure is characteristic of Parkinson's disease. — Stock Photo
    Substantia nigra. Illustration showing a healthy substantia nigra in a human brain. The substantia nigra plays an important role in reward, addiction, and movement. Degeneration of this structure is characteristic of Parkinson's disease.
    Miniature frog sitting on flower — Stock Photo
    Miniature frog sitting on flower
    Abstract male body with detailed Psoas major muscle, computer illustration. — Stock Photo
    Abstract male body with detailed Psoas major muscle, computer illustration.
    3d rendered illustration of back muscles in human body. — Stock Photo
    3d rendered illustration of back muscles in human body.
    Farm Homestead In Winter — Stock Photo
    Farm Homestead In Winter
    Interior of modern bedroom with comfortable bed and big closet in new apartment — Stock Photo
    Interior of modern bedroom with comfortable bed and big closet in new apartment
    Arteries in transparent dog body, cropped, anatomical computer illustration. — Stock Photo
    Arteries in transparent dog body, cropped, anatomical computer illustration.
    Close-up of glossy beaten egg white sticking to metallic whisk attachment of food processor. — Stock Photo
    Close-up of glossy beaten egg white sticking to metallic whisk attachment of food processor.
    Male back anatomy and skeletal system, computer illustration. — Stock Photo
    Male back anatomy and skeletal system, computer illustration.
    Stacked agar plates on plain background. — Stock Photo
    Stacked agar plates on plain background.
    Shoulder bone structure and musculature — Stock Photo
    Shoulder bone structure and musculature
    Human body model demonstrating male anatomy on blue background, digital illustration. — Stock Photo
    Human body model demonstrating male anatomy on blue background, digital illustration.
    2 euro coin in wooden hand on black background in studio showing concept of finance — Stock Photo
    2 euro coin in wooden hand on black background in studio showing concept of finance
    Fresh parsley and rosemary — Stock Photo
    Fresh parsley and rosemary
    Human sperm cells — Stock Photo
    Human sperm cells
    Europe, Grece, Plain of Thessaly, Valley of Penee, World Heritage of UNESCO since 1988, Orthodox Christian monasteries of Meteora perched atop impressive gray rock masses sculpted by erosion — Stock Photo
    Europe, Grece, Plain of Thessaly, Valley of Penee, World Heritage of UNESCO since 1988, Orthodox Christian monasteries of Meteora perched atop impressive gray rock masses sculpted by erosion
    Portrait of bearded man holding wooden block standing in front of white background in a garden, looking at camera. — Stock Photo
    Portrait of bearded man holding wooden block standing in front of white background in a garden, looking at camera.
    3D illustration of influenza virus particle structure — Stock Photo
    3D illustration of influenza virus particle structure
    King Penguins (Aptenodytes patagonicus) on the island of South Georgia, the rookery on Salisbury Plain in the Bay of Isles. Adults coming ashore. Antarctica, Subantarctica, South Georgia — Stock Photo
    King Penguins (Aptenodytes patagonicus) on the island of South Georgia, the rookery on Salisbury Plain in the Bay of Isles. Adults coming ashore. Antarctica, Subantarctica, South Georgia
    Sliced cucumber in test tube, studio shot. — Stock Photo
    Sliced cucumber in test tube, studio shot.
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus. — Stock Photo
    Coloured computed tomography (CT) scan of a section through the chest of a 76-year-old male patient with a malignant (cancerous) tumour (bright, right) of the bronchus.
    Physical male figure with detailed Vastus medialis muscle, digital illustration. — Stock Photo
    Physical male figure with detailed Vastus medialis muscle, digital illustration.
    Human silhouette using gymnastic rings with visible joints, digital illustration. — Stock Photo
    Human silhouette using gymnastic rings with visible joints, digital illustration.
    Weeds in blossom outdoors — Stock Photo
    Weeds in blossom outdoors
    Focus of inflammation in bladder — Stock Photo
    Focus of inflammation in bladder
    Endless agricultural field with harvest ready for cultivation under serene cloudy sky — Stock Photo
    Endless agricultural field with harvest ready for cultivation under serene cloudy sky
    Anatomy of human skin — Stock Photo
    Anatomy of human skin
    Moon rising over mountains in Red Rock Canyon in Nevada. — Stock Photo
    Moon rising over mountains in Red Rock Canyon in Nevada.
    Chromosome structure and composition — Stock Photo
    Chromosome structure and composition
    Abstract silhouette of muscular man, digital illustration. — Stock Photo
    Abstract silhouette of muscular man, digital illustration.
    Wind Turbines on field — Stock Photo
    Wind Turbines on field
    Male silhouette with headache, digital illustration. — Stock Photo
    Male silhouette with headache, digital illustration.
    Close-up green snake gourd on black background. — Stock Photo
    Close-up green snake gourd on black background.
    Human silhouette with selected liver, illustration. — Stock Photo
    Human silhouette with selected liver, illustration.
    Female silhouette with wrist pain, digital illustration. — Stock Photo
    Female silhouette with wrist pain, digital illustration.
    Mother holding little daughter — Stock Photo
    Mother holding little daughter
    Stacked Petri dishes with blood agar on plain background. — Stock Photo
    Stacked Petri dishes with blood agar on plain background.
    Physical male figure with detailed Rhomboid major muscle, digital illustration. — Stock Photo
    Physical male figure with detailed Rhomboid major muscle, digital illustration.
    Woman in bridal gown laughing — Stock Photo
    Woman in bridal gown laughing
    Male head and neck anatomy and blood vessels, computer illustration. — Stock Photo
    Male head and neck anatomy and blood vessels, computer illustration.
    Four yoghurts with berries and cereal — Stock Photo
    Four yoghurts with berries and cereal
    Pancreas tumour, conceptual computer illustration. — Stock Photo
    Pancreas tumour, conceptual computer illustration.
    Lumbar spine in human skeleton, digital illustration. — Stock Photo
    Lumbar spine in human skeleton, digital illustration.
    A lightning bolt encircling the updraft of a low precipitation supercell as it drifts across the High Plains; Corado, United States of America — Stock Photo
    A lightning bolt encircling the updraft of a low precipitation supercell as it drifts across the High Plains; Corado, United States of America
    Human heart position and structure — Stock Photo
    Human heart position and structure
    Realistic digital illustration showing arthritis in human elbow. — Stock Photo
    Realistic digital illustration showing arthritis in human elbow.
    Jaw with stylohyoid muscles — Stock Photo
    Jaw with stylohyoid muscles
    Ribcage and upper body skeletal system — Stock Photo
    Ribcage and upper body skeletal system
    Plains bison bull grazing in meadow of Yellowstone National Park, Montana, USA — Stock Photo
    Plains bison bull grazing in meadow of Yellowstone National Park, Montana, USA
    Nervous system of upper body — Stock Photo
    Nervous system of upper body
    Pain localized in knee joint — Stock Photo
    Pain localized in knee joint
    Full dog musculature with internal organs, digital illustration. — Stock Photo
    Full dog musculature with internal organs, digital illustration.
    Girl sitting on bench — Stock Photo
    Girl sitting on bench
    Muscles and structural anatomy — Stock Photo
    Muscles and structural anatomy
    Digital illustration of trypanosome protozoan parasite causing sleeping sickness transmitted by blood. — Stock Photo
    Digital illustration of trypanosome protozoan parasite causing sleeping sickness transmitted by blood.
    Plains bison grazing on green meadow in Waterton Lakes National Park, Alberta, Canada — Stock Photo
    Plains bison grazing on green meadow in Waterton Lakes National Park, Alberta, Canada
    Europe, Grece, Plain of Thessaly, Valley of Penee, World Heritage of UNESCO since 1988, Orthodox Christian monasteries of Meteora perched atop impressive gray rock masses sculpted by erosion, the Roussanou convent — Stock Photo
    Europe, Grece, Plain of Thessaly, Valley of Penee, World Heritage of UNESCO since 1988, Orthodox Christian monasteries of Meteora perched atop impressive gray rock masses sculpted by erosion, the Roussanou convent
    Normal human sperm cells — Stock Photo
    Normal human sperm cells
    Human skin anatomy and blood supply — Stock Photo
    Human skin anatomy and blood supply
    Row of four green Anjou pears on table — Stock Photo
    Row of four green Anjou pears on table