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confident man pointing on chemical structure of testosterone at chalkboard
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dreamstime
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anabolic
attention
attractive
background
beard
bearded
black
blackboard
board
chalk
chalkboard
checkered
cheerful
chemical
chemist
chemistry
confident
drawing
element
formula
glasses
graphic
handsome
happy
hormone
idea
illustration
male
man
medical
molecular
molecule
plaid
professor
research
science
scientific
scientist
shirt
smiling
standing
steroid
student
studio
testosterone
thought
university
young