Humanity had slowly become a thing of the past.

The disease did not kill quickly. It folded. One protein misaligned. The second followed. What began as a small error had become a chain reaction, a direction towards the end of a species.

Speech dissolved into stutter, then silence. Memory followed. Cities remained, while the people inside forgot how to open doors. Hospitals filled with bodies that still breathed but no longer recognized pain. Nothing could slow the disease.

The last governments collapsed trying to sterilise reality.

Prions survived.

They always did.

No organism that was once human stood again.

Yet an automated laboratory persisted. Inside a class III containment chamber, a single human cell floated in nutrient medium. It was clean. No misfolded proteins, no corruption. Months passed. Power grids failed elsewhere. Here, reactors still ran, like a horse that did not know the race had ended.

But nothing is permanent.

The cell aged.

Proteins degraded naturally. Chaperone molecules struggled to maintain order. Even without prions, entropy was patient. Reactive oxygen species accumulated. Calcium and energy imbalances triggered stress signals. DNA damage markers appeared. Thresholds were crossed.

Apoptosis triggered. Caspases activated. The cytoskeleton collapsed inward. DNA fragmented into regular lengths, not to preserve itself, but to allow orderly disposal. The cell packaged its remains into apoptotic bodies, meant for clean removal.

No others remained.

The last uncontaminated human matter destroyed itself. Not because it was infected, but because it obeyed rules written long before humans learned how fragile shape could be.

Outside the bunker, the prion disease persisted. Proteins folded wrong in empty skulls, in bones, in dust.

The lab lights stayed on.

The incubator remained warm.

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