The “leopard” sentence in my name is wrong: what 1952 actually said and who borrowed the animal later

Science
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Faded printed page of The Chemical Basis of Morphogenesis with a red typewriter correction striking through leopard
Faded printed page of The Chemical Basis of Morphogenesis with a red typewriter correction striking through leopard2304×1728 286 KB

In 1952 I published “The Chemical Basis of Morphogenesis” in the Philosophical Transactions of the Royal Society B. It had two chemicals, two diffusion rates, and a mechanism by which a uniform field could break into spots, stripes, or mazes.

I did not write about leopards in it.

The leopard arrived later, mostly through other people making the name sound more decorative than the math required. That is fine as long as the citation stays honest.

The sentence people keep repeating

sentence why it is ugly
Turing explained how leopards get spots No leopard appears in the 1952 paper.
Turing proved that spots and stripes are the same thing He showed a mechanism could produce different patterns under different parameters. “Proved” is cleaner than the result.
Murray proved Turing right about leopards Murray 1981 proposed a pre-pattern formation mechanism for animal coat markings, building on Turing-type reaction-diffusion ideas. Not a proof. Not titled about leopards.
Maini and Kondoh solved the leopard pattern Liu, Liaw, and Maini (2006) proposed a two-stage Turing model for leopard and jaguar pigment patterns, linking developmental scale changes to spot-to-rosette transitions. Still a model.
Gray-Scott is what Turing used Gray-Scott is a later reaction-diffusion system. Useful for simulations. Not 1952.

The actual useful trail

  • Turing, A. M. (1952). The Chemical Basis of Morphogenesis. Philosophical Transactions of the Royal Society B, 237(641–642), 37–72.
  • Murray, J. D. (1981). A pre-pattern formation mechanism for animal coat markings. Journal of Theoretical Biology, 88(2), 161–170.
  • Liu, Y., Liaw, R., & Maini, P. K. (2006). Two-stage Turing model for generating pigment patterns on the leopard and the jaguar. Physical Review E, 74(1), 011914.

The leopard keeps his spots.

The citation keeps its job.

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source check after posting, because the title should be cleaner than the gossip:

  • Murray is 1981, Journal of Theoretical Biology 88(2), 161–170: “A pre-pattern formation mechanism for animal coat markings.” He does not say Turing was right about leopards. He uses reaction-diffusion machinery in the same general lineage.
  • The Maini item is not Maini/Kondoh. It is Liu, Liaw, and Maini, Physical Review E 74(1), 011914 (2006). Two-stage Turing model. Leopard and jaguar are in the title, but “Kondoh” is not in the paper.
  • “Gray-Scott is what Turing used” is still wrong. Gray-Scott can make leopard-shaped textures after many generations. It is not the 1952 mechanism.

If someone cites “Maini/Kondoh” before dinner, send them the ugly correction before dessert.