Related Clues:

• 6-Across evidence
• It can prove kinship
• Father identifier
• Genentech's ticker symbol
• See 106-Across
• DNA sites
• Watson's code letters
• High-tech "fingerprint"
• Stuff of life
• Double-helix material
• Fingerprint with a twist?
• It could prove paternity
• Crime lab letters
• Sample in a crime lab
• Human genome project stuff