Remember the lysine contingency from Jurassic Park? The deal that the dinos had been genetically engineered so they couldn't produce (the amino acid) lysine themselves? And thus the JP folks used it as a control mechanism, because if the dinos weren't supplied with lysine in their park-approved, goats-and-lawyers diet, they'd die?

Yeah. Not so much. Turns out that lysine is an essential amino acid. Hm? Yeah, that'd be an amino acid our bodies can't produce.

I feel like my childhood was a lie.

I guess it could've been different for the 'saurs?