Related Clues:

• Pavlov's dogs produced it
• Pavlovian pooch output
• Spitball stuff
• Aid to digestion
• Glandular output
• Source of DNA evidence, often
• Spit
• Escalates
• It may be on the tip of your tongue
• DNA source, often
• Intensifies, informally
• Pavlovian production
• Drool, basically
• Mouth watering?
• DNA source, sometimes