alert
area
attention
background
bacteria
beware
bio
biohazard
biological
biology
black
caution
chemical
contamination
danger
dangerous
element
environment
epidemic
forbidden
hazard
hazardous
icon
illustration
isolated
lab
logo
poison
pollution
protect
protection
research
restricted
risk
safety
science
security
sign
substance
symbol
toxic
triangle
virus
warn
waste
weapon
yellow
zone
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