Epic Quest Bio The case files
Case No. 92 · have you seen this molecule?

Actinidin

why kiwi stops gelatin from setting

File sealed

The detectives are still writing this one up. The poster and the facts are below; the film and the interrogation room open soon.

Booking photographs

Actinidin, front view, against a height chart in nanometers
FRONT
Actinidin, side view
SIDE · PDB 2ACT

The suspect, from its real atomic coordinates. Drag to turn it. Height chart in nanometers, a line every nanometer. A kiwi is about nine million times wider.

Rap sheet

Answers to
Actinidain. Kin to papain.
Height
5.7 nm, standing on end.
Weight
39 zeptograms
Build
220 amino acids in two lobes, a cleft between.
Marks
A cysteine in the cleft does the cutting.
Habits
Cuts gelatin to pieces. Gelatin made with fresh kiwi won’t set.
Known for
Tenderizing meat.
Weakness
Heat. It comes apart at 140 °F.
Origins
Green kiwifruit. Gold kiwis carry almost none.
Last seen
A 5 mL tube marked KIWI in the fridge at HQ.
2,600,000,000,000,000,000

of them in one green kiwi, give or take.
Kiwis vary. You’ve never seen one.

The poster on the street

The wanted poster for Actinidin

This is the photocopied wanted poster for Actinidin, No. 92. They were made for noticeboards around Boston, Cambridge and the rest of the east coast.

Found one? Scan its QR code with your phone. If you're a signed-in player, the sighting goes on your record with +1 XP.

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