Related Clues:
- Phi-Kappa middle
- Code of life
- It's shared by identical twins
- Alpha, ___, gamma ...
- CSI concern
- 6-Across evidence
- It can prove kinship
- Father identifier
- Genentech's ticker symbol
- Second in a Greek series
- Not yet final, in a way
- See 106-Across
- Watson's code letters
- Early VCR format
- High-tech "fingerprint"