Related Clues:
- Chromosome molecule
- Geneticists' chain letters?
- Messenger ___ (geneticist's concern)
- Genetic carrier, briefly
- Messenger that works with 49-Across
- Cell stuff letters
- Chain letters, genetically
- Stuff in the gene pool
- Evidence that's hard to refute
- Essence of everyone
- Brief genetic material
- Type of lab or fingerprint
- CSI lab material
- Genetic blueprint, initially
- Transfer or messenger ___