Enfoque selectivo del científico afroamericano en gafas mirando la muestra de sangre en frasco - Metraje y vídeo de stock

KAZAN, TATARSTAN/RUSSIA - AUGUST 22 2017: Closeup happy man lab assistant in protective glasses looks at bulb with black raw oil in modern test laboratory on August 22 in Kazan

Employment agency, female manager in eyeglasses talking to trainee at office

Portrait of smiling african american doctor in glasses looking at camera

Female doctor, nurse in hospital shows the pills to be taken to his patient. Healthcare and medical concept

Portrait of smiling african american doctor in glasses looking at camera

Close up view of african american scientist in glasses using microscope

Selective focus of african american scientist in glasses using microscope with sunlight on background

African american scientist in glasses using microscope and then looking at camera

Close up view of african american scientist in glasses using microscope with backlit

Cropped view of scientist taking blood sample on glass