20s
30s
african american
black
caucasian
chemistry
expertise
female
five people
gesture
group
happy
horizontal
human face
lab coat
laboratory
line
looking at camera
male
man
men
mixed race
multiethnic group
people
person
portrait
professional occupation
research
science
scientist
smiling
staff
standing
studying
team
technician
thirties
thumbs up
together
twenties
woman
women
working