bacterium
beaker
biology
biotechnology
blood
blue
blue gloves
caucasian
chemist
chemistry
color image
contemporary
discovery
examination
expertise
health care and medicine
horizontal
hospital
hygiene
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laboratory
learning
medical exam
medical test
microbiology
microscope
nurse
occupation
one person
photography
professional occupation
research
sample
science
scientific experiment
scientist
serious
student
technology
tube
tubing
virus
white
woman
working