Related Clues:
- Stranded cellular stuff
- Genetic code transmitter
- Letters vital in biology class
- Certain code carrier
- Retrovirus molecule
- Virus component, often
- Chromosome molecule
- Geneticists' chain letters?
- Messenger ___ (geneticist's concern)
- Genetic carrier, briefly
- Messenger that works with 49-Across
- Cell stuff letters
- Chain letters, genetically
- Brief genetic material
- Transfer or messenger ___