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In Jurassic Park, we're told that the dinosaurs are built with a failsafe.

ARNOLD: The lysine contingency is intended to prevent the spread of the animals in case they ever got off the island. Dr. Wu inserted a gene that makes a single faulty enzyme in protein metabolism. The animals can't manufacture the amino acid lysine. Unless they're continually supplied with lysine by us, they slip into a coma and die.

Which is all fine and good-- unless you then make three five sequels filled with dinosaurs, none of which are being provided lysine. The first two sequels take place on an island that's been completely abandoned by In-Gen. Jurassic World features the original T-Rex, even though it should have died after the first Jurassic Park was abandoned.

Did they ever address this address this in the sequels?

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2 Answers2

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On the Masrani website created for the promotion of Jurassic World, there is a "computer terminal" one can use. After typing READ ENTER 05121994 ENTER, the following is displayed:

A list of logs on a computer terminal, one read, transcribed below.

---BEGIN LOG---

OWNER: WU, HENRY
DATE: 05/12/1994 1215 CST
SUBJECT: LYSINE
NOTES: THERE MUST BE A HICCUP IN THE LYSINE CONTINGENCY SOMEWHERE. THE ANIMALS HAVE NOT PERISHED. WHAT'S MORE ASTONISHING IS THAT THEY'RE BREEDING. I'VE SEEN THE NESTS MYSELF. ONE CAN ONLY ASSUME INCLUSIONS FROM HYPEROLIUS VIRIDIFLAVUS WERE TO BLAME. COMPLETELY UNPRECEDENTED IN MY FIELD OF RESEARCH. LIFE FOUND A WAY?

---END LOG---

It is a log message by Henry Wu, dated 12 May 1994, noting that the lysine contingency has failed and that they're breeding. He assumes that inclusions from Hyperolius viridiflavus (common reed frog) were to blame, without specifying to blame for what, so the message can be read as either, or both.

SQB
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    A great find. This log entry was written after the events of Jurassic Park – Valorum Sep 21 '23 at 14:10
  • A bit of a weak answer, I must admit, since he may have meant only the latter part. But an interesting website nonetheless. I've read an explanation of how they cloned an aquatic animal (not many mosquitos under water) and for the lack of feathers (again, frog DNA). – SQB Sep 21 '23 at 14:14
  • Don't sell it short. The fact that Wu acknowledges that it worked, but then suddenly didn't (due to precisely the same issues they had with the 'fertility contingency') is a really solid explanation. – Valorum Sep 21 '23 at 14:45
  • @Valorum also see https://scifi.stackexchange.com/a/279217/19561 – SQB Sep 21 '23 at 15:22
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So my comment was right. Based on http://jurassicpark.wikia.com/wiki/Lysine_contingency

It says that the dinosaurs ate foods that were rich in Lysine, like soya beans or chickens, while the carnivores simply ate the herbivores.

Also, after some Googling, I found In the book "Jurassic Park" does the Lysine Contingency actually get explained? which the answer explains where in the book it is found. Just in case you wanted to know that as well.

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