DNA sequencing and stone tool: what they have in common

1. Step 1. DNA sequencing — is used in — mRNA vaccine. Developed from a sequenced genome.
2. Step 2. mRNA vaccine — is a kind of — Vaccine. A vaccine.
3. Step 3. Vaccine — uses — Syringe. Injections.
4. Step 4. Syringe — has part — Needle. A hollow needle.
5. Step 5. Needle — evolved from — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.

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