Related Clues:

• Word of disappointment
• Scoundrels
• 'Curses!'
• Refuse visitors
• 'Doggone it!'
• Tellers?
• Charlie Brown exclamation
• Plague carriers
• Vermin
• Charlie Brown oath
• Snitches
• Lab subjects
• Phooey!
• 'Good grief!'
• They may be found in labs