Show them to Mews then follow the instructions on the DNA test. After the x-ray tray is in the developer, press the flashing button to get the result.
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Take the shells back to the Mews lab and test them. The DNA analyzer will prove the existence of the Jersey Devil.
You get the fur from a fence in Puerto Rico. Back at the lab, you run a DNA test, but it turns out to be ordinary coyote fur.
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Bring them back to the Mews lab for DNA testing.
There are only 2 items you check with the DNA analyzer: the fur from Puerto Rico and the egg shells from New Jersey. If you follow the test process carefully (and press the devleop button on the developer), Mews will tell you the results.
You process the samples for DNA in the Lab, the left side of the Museum in the Mews mansion. (It is on the first floor to the right.) Follow the instructions to test samples, and show any photos to Mews.
There is only one flashing button on the DNA developer. Unfortunately they forgot to label it "develop" as suggested by the instructions. If you don't open the second page, it may give you an error message even when you have done everything correctly.
You can only test two samples: the fur you bring back from your first trip to Puerto Rico, and the egg shells you bring back from New Jersey. Show these to Mews to start the DNA testing (follow the instructions, and even then you may have to do it twice).
On your first trip to Puerto Rico, drive the jeep to the house of the herder's brother (right side star). He says some fur on the fence is from the chupacabra. Take it back to run a DNA test, but it turns out to be from a wild dog.
The final step in the DNA testing is to put the x-ray film into the developer. The button will flash, so you should press it then. It was supposed to be labeled but wasn't.
For the truck at Loch Ness, click the left side, then let some air out of the tire by clicking the valve stem. For the farmer at Puerto Rico, bring his brother some chicken feed, and you can get some fur to test for DNA.