The biology
Recombinant DNA is the cutting, rejoining, sequencing and rewriting of DNA. Restriction enzymes cut at specific palindromic sites — but the cell methylates its own recognition sites, so its nuclease cuts only foreign, unmethylated DNA. The book calls this restriction–modification system ‘a small-scale immune system’. Cloning carries a fragment on a vector and makes many identical copies.
Self and not-self, read on the address
Restriction–modification is self/non-self recognition read on the address itself: the methyl marks are the cell's signature on its own coordinate, and anything unsigned is foreign and cut. This is the same address-matching operation that reappears as vertebrate immunity and as anti-cancer surveillance (Papers 20 and 23) — one faculty at three scales. Genetic engineering is editing the address directly, taking up the pen the field has always held.
Where this departs from current science
| Current science says | The Force of Time says |
|---|---|
| Restriction–modification is a bacterial defence against phage. | It is self/non-self recognition read on the address — the same operation as immunity and cancer surveillance. |
| Methylation is a chemical tag for strand or site discrimination. | It is the cell's signature on its own coordinate; the unsigned is foreign. |
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This paper, and any information drawn from it, may be used freely provided the reference attribution to Stephen Daubney and The Daubney Foundation is recognised.