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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.
    Human nervous system, computer illustration — Stock Photo
    Human nervous system, computer illustration
    Sunrise over the Geisler (Odle) and Puez mountains in South Tyrol. The Dolomites are listed as UNESCO World heritage. europe, central europe, italy — Stock Photo
    Sunrise over the Geisler (Odle) and Puez mountains in South Tyrol. The Dolomites are listed as UNESCO World heritage. europe, central europe, italy
    Digital artwork of substantia nigra from human brain. — Stock Photo
    Digital artwork of substantia nigra from human brain.
    Guatemalan Public Landry, Antigua, Guatemala — Stock Photo
    Guatemalan Public Landry, Antigua, Guatemala
    Historic small town Obidos with a medieval old town, a tourist attraction north of Lisboa Europe, Southern Europe, Portugal — Stock Photo
    Historic small town Obidos with a medieval old town, a tourist attraction north of Lisboa Europe, Southern Europe, Portugal
    Mascagni artwork of human brain — Stock Photo
    Mascagni artwork of human brain
    Red hanging bridge going through magnificent rainforest in Costa Rica, Central America — Stock Photo
    Red hanging bridge going through magnificent rainforest in Costa Rica, Central America
    Natural landscape with cultivated agricultural blooming field in Czech Republic — Stock Photo
    Natural landscape with cultivated agricultural blooming field in Czech Republic
    Empty street at Chong Nonsi station in the CBD area of Bangkok — Stock Photo
    Empty street at Chong Nonsi station in the CBD area of Bangkok
    Close-up shot of delicious Fresh tomatillos and chilies — Stock Photo
    Close-up shot of delicious Fresh tomatillos and chilies
    Old tour bus with electrical wires — Stock Photo
    Old tour bus with electrical wires
    The heart in the constellation Cygnus and North America nebula and Pelican, preserved under sky light pollution — Stock Photo
    The heart in the constellation Cygnus and North America nebula and Pelican, preserved under sky light pollution
    Section through the cerebellum in the brain — Stock Photo
    Section through the cerebellum in the brain
    Ice chunks dot Portage Lake — Stock Photo
    Ice chunks dot Portage Lake
    Nerve cells and axon connections — Stock Photo
    Nerve cells and axon connections
    Kazakhstan, Almaty Province, Raiymbek District, Charyn Canyon, Kazakhstan — Stock Photo
    Kazakhstan, Almaty Province, Raiymbek District, Charyn Canyon, Kazakhstan
    Desks and chairs in University Library of Slovenia, Ljubljana, Central Slovenia, Slovenia — Stock Photo
    Desks and chairs in University Library of Slovenia, Ljubljana, Central Slovenia, Slovenia
    Abstract male silhouette with visible brain and nerves of nervous system, computer illustration. — Stock Photo
    Abstract male silhouette with visible brain and nerves of nervous system, computer illustration.
    Close-up of a Musk Ox calf born in the spring on the Musk Ox farm, South-central Alaska; Palmer, Alaska, United States of America — Stock Photo
    Close-up of a Musk Ox calf born in the spring on the Musk Ox farm, South-central Alaska; Palmer, Alaska, United States of America
    Visual rendering of human brain — Stock Photo
    Visual rendering of human brain
    Mother and daughter playing on beach, Cabo San Lucas, Mexico — Stock Photo
    Mother and daughter playing on beach, Cabo San Lucas, Mexico
    Central park lake at winter — Stock Photo
    Central park lake at winter
    The dolomites landscape in the Veneto. Monte Pelmo, Averau, Nuvolau and Ra Gusela in the background. The Dolomites are listed as UNESCO World heritage. europe, central europe, italy — Stock Photo
    The dolomites landscape in the Veneto. Monte Pelmo, Averau, Nuvolau and Ra Gusela in the background. The Dolomites are listed as UNESCO World heritage. europe, central europe, italy
    Vittor Pisani in Milan, cityscape — Stock Photo
    Vittor Pisani in Milan, cityscape
    Conceptual illustration of degeneration of dopaminergic neurons. — Stock Photo
    Conceptual illustration of degeneration of dopaminergic neurons.
    Asado de bodas (Mexican pork stew with rice) — Stock Photo
    Asado de bodas (Mexican pork stew with rice)
    Scenic view of Buddha Statue at Borobudur, Magelang, Yogyakarta, Central Java, Indonesia — Stock Photo
    Scenic view of Buddha Statue at Borobudur, Magelang, Yogyakarta, Central Java, Indonesia
    Peaceful view of contemporary metropolis with skyscrapers and residential buildings under orange sky in twilight — Stock Photo
    Peaceful view of contemporary metropolis with skyscrapers and residential buildings under orange sky in twilight
    Turkmenistan, Lebap, The river Amudarya forms over long stretches the heavily guarded border to Turkmenistan, a country largely isolated and unknown under an eccentric dictator — Stock Photo
    Turkmenistan, Lebap, The river Amudarya forms over long stretches the heavily guarded border to Turkmenistan, a country largely isolated and unknown under an eccentric dictator
    Cingulate gyrus in the brain — Stock Photo
    Cingulate gyrus in the brain
    Two business partners discussing work in office — Stock Photo
    Two business partners discussing work in office
    Medical illustration of pituitary gland anatomy — Stock Photo
    Medical illustration of pituitary gland anatomy
    Green hummingbird sitting on sprig on blurred background — Stock Photo
    Green hummingbird sitting on sprig on blurred background
    Aerial view of New York island and skyscrapers of Manhattan with peaceful channel water in sunlight — Stock Photo
    Aerial view of New York island and skyscrapers of Manhattan with peaceful channel water in sunlight
    Ringed kingfisher bird perched on dry wood in Costa Rica, Central America. — Stock Photo
    Ringed kingfisher bird perched on dry wood in Costa Rica, Central America.
    Mother and daughter playing on beach, Cabo San Lucas, Mexico — Stock Photo
    Mother and daughter playing on beach, Cabo San Lucas, Mexico
    Black (Tuscan) kale in a colander over black background — Stock Photo
    Black (Tuscan) kale in a colander over black background
    The cascades in the valley of river Isel in fall, national park Hohe TauernEurope, central europe, austria, East Tyrol — Stock Photo
    The cascades in the valley of river Isel in fall, national park Hohe TauernEurope, central europe, austria, East Tyrol
    Urban scene of Beijing contemporary architecture — Stock Photo
    Urban scene of Beijing contemporary architecture
    Southside View Of Mt. Mckinley And Mt. Hunter — Stock Photo
    Southside View Of Mt. Mckinley And Mt. Hunter
    Assorted cactus and succulent plants on shelf garden. — Stock Photo
    Assorted cactus and succulent plants on shelf garden.
    An adult bald eagle (Haliaeetus leucocephalus) perched on a dead tree. South-central Alaska; Alaska, United States of America — Stock Photo
    An adult bald eagle (Haliaeetus leucocephalus) perched on a dead tree. South-central Alaska; Alaska, United States of America
    Spaghetti with jalapeno sauce — Stock Photo
    Spaghetti with jalapeno sauce
    Mailboxes at the Central Post Office building, Asmara, Central Region, Eritrea — Stock Photo
    Mailboxes at the Central Post Office building, Asmara, Central Region, Eritrea
    Tuk tuk driving on street in Monjas, Guatemala — Stock Photo
    Tuk tuk driving on street in Monjas, Guatemala
    Gorgonians with reef-building corals on reef — Stock Photo
    Gorgonians with reef-building corals on reef
    Green exotic frog sitting on leaf on black background — Stock Photo
    Green exotic frog sitting on leaf on black background
    Historic colonial district street at dawn with walls of buildings, Guatemala — Stock Photo
    Historic colonial district street at dawn with walls of buildings, Guatemala
    Nice views of the skyscrapers of New York City — Stock Photo
    Nice views of the skyscrapers of New York City
    Human brain with highlighted middle frontal gyrus, computer illustration. It is part of the prefrontal cortex of the frontal lobe. It is involved in language, learning and attention. — Stock Photo
    Human brain with highlighted middle frontal gyrus, computer illustration. It is part of the prefrontal cortex of the frontal lobe. It is involved in language, learning and attention.
    Male nervous system in body silhouette, computer illustration. — Stock Photo
    Male nervous system in body silhouette, computer illustration.
    Center pivot irrigation in field near Lethbridge, Alberta, Canada — Stock Photo
    Center pivot irrigation in field near Lethbridge, Alberta, Canada
    Nerve cell with many dendrites on blue background, digital illustration. — Stock Photo
    Nerve cell with many dendrites on blue background, digital illustration.
    Albert Hall (Central Museum) — Stock Photo
    Albert Hall (Central Museum)
    Black bears on a hillside with Exit Glacier in Kenai Fiords National Park, South-central Alaska; Alaska, United States of America — Stock Photo
    Black bears on a hillside with Exit Glacier in Kenai Fiords National Park, South-central Alaska; Alaska, United States of America
    Tumour affecting the pituitary gland — Stock Photo
    Tumour affecting the pituitary gland
    Family walking together in park — Stock Photo
    Family walking together in park
    Domestic pig in Nicaragua — Stock Photo
    Domestic pig in Nicaragua
    Turkey, Greme National Park and the rock sites of Cappadocia, city of Ushisar and Mount Erciyes enneig (ancient volcano, 3917m) (UNESCO World Heritage) — Stock Photo
    Turkey, Greme National Park and the rock sites of Cappadocia, city of Ushisar and Mount Erciyes enneig (ancient volcano, 3917m) (UNESCO World Heritage)