Smallpox vaccine and laser: what they have in common

1. Step 1. Smallpox vaccine — is a kind of — Vaccine. The first vaccine.
2. Step 2. Vaccine — includes — mRNA vaccine. A vaccine.
3. Step 3. mRNA vaccine — uses — DNA sequencing. Developed from a sequenced genome.
4. Step 4. DNA sequencing — uses — Laser. Fluorescent sequencing.

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